We don't observe the Earth moving towards an apple when it falls primarily due to the significant disparity in mass between the Earth and the apple, combined with the gravitational acceleration experienced on Earth's surface. The Earth, with a mass of approximately 5.97 x 10 power 24 kilograms, exerRead more
We don’t observe the Earth moving towards an apple when it falls primarily due to the significant disparity in mass between the Earth and the apple, combined with the gravitational acceleration experienced on Earth’s surface.
The Earth, with a mass of approximately 5.97 x 10 power 24 kilograms, exerts a gravitational force on the apple, which has a much smaller mass, typically around 0.1 kilograms. According to Newton’s law of universal gravitation, every mass attracts every other mass in the universe with a force that depends on the masses of the objects and the distance between them. However, the magnitude of this force is proportional to the product of the masses and inversely proportional to the square of the distance between them.
When an apple falls towards the Earth, it accelerates due to the Earth’s gravitational field, which on the Earth’s surface is approximately 9.81 meters per second squared 9.81 m/second square. This acceleration is directed towards the center of the Earth. The force exerted by the Earth on the apple causes it to accelerate downward, while the Earth’s acceleration towards the apple is so minuscule that it is effectively negligible and imperceptible.
In practical terms, the Earth’s mass is so vast compared to the apple that the resulting acceleration of the Earth towards the apple is far too small to observe or measure directly. Therefore, from our perspective on Earth’s surface, we simply observe the apple falling due to the Earth’s gravitational pull, without noticing any movement of the Earth towards the apple. This concept underscores the importance of considering relative masses and forces in gravitational interactions between objects.
Supersonic aircraft are designed to travel at speeds that exceed the speed of sound, which is approximately 343 meters per second (1,235 kilometers per hour or 767 miles per hour) at sea level. The speed of sound, also known as Mach 1, can vary with altitude and atmospheric conditions. When an aircrRead more
Supersonic aircraft are designed to travel at speeds that exceed the speed of sound, which is approximately 343 meters per second (1,235 kilometers per hour or 767 miles per hour) at sea level. The speed of sound, also known as Mach 1, can vary with altitude and atmospheric conditions. When an aircraft surpasses this speed, it is referred to as supersonic. These aircraft have various applications, including commercial travel, reducing flight times significantly, and military uses, offering strategic advantages due to their speed. Examples of supersonic aircraft include the Concorde, which was used for commercial flights, and military jets like the F-22 Raptor. The development and use of supersonic aircraft involve complex engineering challenges, particularly concerning noise (sonic booms), fuel efficiency, and environmental impact. Therefore, the correct answer to the given question is; option [C] at more than the speed of sound.
The velocity of sound in air is significantly influenced by temperature. As the temperature increases, the speed of sound in air also increases. This happens because warmer air causes air molecules to gain more kinetic energy, which makes them vibrate and collide more quickly, facilitating faster trRead more
The velocity of sound in air is significantly influenced by temperature. As the temperature increases, the speed of sound in air also increases. This happens because warmer air causes air molecules to gain more kinetic energy, which makes them vibrate and collide more quickly, facilitating faster transmission of sound waves. Conversely, as the temperature decreases, the speed of sound decreases because the air molecules have less kinetic energy, resulting in slower vibrations and collisions. The relationship between temperature and the speed of sound can be quantified using the formula:
v = 331.3 + 0.6 x T
where 𝑣 is the speed of sound in meters per second and 𝑇 is the temperature in degrees Celsius. Hence, colder temperatures lead to a slower speed of sound. Therefore, the correct answer is; option [D] decreases with decreasing temperature.
The speed of sound varies significantly across different mediums due to differences in density and elasticity. In general, sound travels fastest in solids, followed by liquids, and slowest in gases. This is because molecules in solids are more tightly packed and can transmit vibrations more efficienRead more
The speed of sound varies significantly across different mediums due to differences in density and elasticity. In general, sound travels fastest in solids, followed by liquids, and slowest in gases. This is because molecules in solids are more tightly packed and can transmit vibrations more efficiently.
At approximately 20 °C, the speed of sound in air is around 343 meters per second, in water it is about 1,480 meters per second, in granite it ranges from 5,000 to 6,000 meters per second, and in iron, it is approximately 5,120 meters per second. Among these, the speed of sound is highest in solids like granite and iron due to their dense molecular structure.
Between granite and iron, iron typically exhibits slightly higher speeds due to its material properties. Thus, at 20 °C, the speed of sound is maximum in; option [D] Iron.
The velocity of sound depends on the medium through which it travels, varying significantly across gases, liquids, and solids. In solids, the molecules are closely packed, which allows sound waves to travel more efficiently and rapidly. Therefore, the speed of sound is highest in solids. In liquids,Read more
The velocity of sound depends on the medium through which it travels, varying significantly across gases, liquids, and solids. In solids, the molecules are closely packed, which allows sound waves to travel more efficiently and rapidly. Therefore, the speed of sound is highest in solids. In liquids, the molecules are less tightly packed than in solids but more so than in gases, resulting in a moderate speed of sound. In gases, the molecules are farthest apart, causing the slowest transmission of sound waves.
For instance, at room temperature, the speed of sound in air (a gas) is approximately 343 meters per second, in water (a liquid) it is about 1,480 meters per second, and in steel (a solid), it is around 5,960 meters per second. This illustrates the trend of increasing sound velocity from gases to liquids to solids. Thus, the correct answer is; option [B] Varies and is highest in solid.
Sound waves travel at different speeds depending on the medium. In solids, sound waves travel the fastest because the molecules are tightly packed, allowing for efficient transmission of vibrations from one molecule to the next. This close proximity facilitates rapid propagation of sound waves. In lRead more
Sound waves travel at different speeds depending on the medium. In solids, sound waves travel the fastest because the molecules are tightly packed, allowing for efficient transmission of vibrations from one molecule to the next. This close proximity facilitates rapid propagation of sound waves. In liquids, the molecules are less densely packed than in solids, resulting in slower sound transmission. In gases, the molecules are spaced far apart, causing the slowest speed of sound as the vibrations take longer to travel from one molecule to another. In a vacuum, there are no molecules to transmit sound, so sound waves cannot travel at all.
For example, at room temperature, sound travels at about 343 meters per second in air (a gas), approximately 1,480 meters per second in water (a liquid), and around 5,960 meters per second in steel (a solid). Hence, the correct answer is; option [A] In solids.
The speed of sound in air is influenced by temperature and atmospheric conditions. At room temperature, which is typically considered to be around 20°C (68°F), the speed of sound is approximately 343 meters per second (m/s). This speed decreases with lower temperatures and increases with higher tempRead more
The speed of sound in air is influenced by temperature and atmospheric conditions. At room temperature, which is typically considered to be around 20°C (68°F), the speed of sound is approximately 343 meters per second (m/s). This speed decreases with lower temperatures and increases with higher temperatures. The variations are relatively small in everyday conditions. Given the options, 330 m/s is the closest to the actual speed of sound in air at room temperature. Accurate knowledge of the speed of sound is crucial for various applications, including aviation, acoustics, and meteorology. While precise values might be needed for scientific calculations, an approximation of 330 m/s is often sufficient for general purposes. Therefore, the correct answer is; option [A] 330 m/s.
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 3Read more
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 343 meters per second in air. Consequently, the flash of lightning is seen almost instantly, while the sound of thunder takes longer to reach observers due to its slower propagation speed.
This delay allows us to estimate the distance of a lightning strike by counting the seconds between seeing the lightning and hearing the thunder (since sound travels approximately 1 kilometer in 3 seconds). The phenomenon underscores the fundamental difference in speed between light and sound waves, influencing how we perceive and interpret distant events like thunderstorms. Therefore, the correct answer explaining the delay is [D] The speed of light is much greater than the speed of sound.
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance andRead more
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance and can travel efficiently through its solid structure, making it useful in applications where rapid transmission of sound is necessary, such as in buildings, bridges, and machinery.
In contrast, sound travels much slower in air, water, and vacuum due to differences in their molecular structures and densities. Air, for example, has low density and elasticity compared to solids like steel, resulting in a slower speed of sound propagation. Therefore, among the substances listed, steel is the material through which sound travels the fastest due to its favorable acoustic properties.
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationshRead more
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationship between pressure and the speed of sound in gases is indirect and complex, with temperature having a more pronounced effect on the density and elasticity of the medium.
In practical terms, doubling the pressure in air at a constant temperature does not double the speed of sound. It would require extreme changes in pressure or modifications in temperature to significantly alter the speed of sound in air. Thus, under the conditions given, the correct answer remains [B] 332 m/sec, reflecting the stability of the speed of sound in air under varying pressure conditions within normal ranges.
Why don’t we observe the Earth moving towards an apple when it falls?
We don't observe the Earth moving towards an apple when it falls primarily due to the significant disparity in mass between the Earth and the apple, combined with the gravitational acceleration experienced on Earth's surface. The Earth, with a mass of approximately 5.97 x 10 power 24 kilograms, exerRead more
We don’t observe the Earth moving towards an apple when it falls primarily due to the significant disparity in mass between the Earth and the apple, combined with the gravitational acceleration experienced on Earth’s surface.
The Earth, with a mass of approximately 5.97 x 10 power 24 kilograms, exerts a gravitational force on the apple, which has a much smaller mass, typically around 0.1 kilograms. According to Newton’s law of universal gravitation, every mass attracts every other mass in the universe with a force that depends on the masses of the objects and the distance between them. However, the magnitude of this force is proportional to the product of the masses and inversely proportional to the square of the distance between them.
When an apple falls towards the Earth, it accelerates due to the Earth’s gravitational field, which on the Earth’s surface is approximately 9.81 meters per second squared 9.81 m/second square. This acceleration is directed towards the center of the Earth. The force exerted by the Earth on the apple causes it to accelerate downward, while the Earth’s acceleration towards the apple is so minuscule that it is effectively negligible and imperceptible.
In practical terms, the Earth’s mass is so vast compared to the apple that the resulting acceleration of the Earth towards the apple is far too small to observe or measure directly. Therefore, from our perspective on Earth’s surface, we simply observe the apple falling due to the Earth’s gravitational pull, without noticing any movement of the Earth towards the apple. This concept underscores the importance of considering relative masses and forces in gravitational interactions between objects.
See lessSupersonic aircraft fly
Supersonic aircraft are designed to travel at speeds that exceed the speed of sound, which is approximately 343 meters per second (1,235 kilometers per hour or 767 miles per hour) at sea level. The speed of sound, also known as Mach 1, can vary with altitude and atmospheric conditions. When an aircrRead more
Supersonic aircraft are designed to travel at speeds that exceed the speed of sound, which is approximately 343 meters per second (1,235 kilometers per hour or 767 miles per hour) at sea level. The speed of sound, also known as Mach 1, can vary with altitude and atmospheric conditions. When an aircraft surpasses this speed, it is referred to as supersonic. These aircraft have various applications, including commercial travel, reducing flight times significantly, and military uses, offering strategic advantages due to their speed. Examples of supersonic aircraft include the Concorde, which was used for commercial flights, and military jets like the F-22 Raptor. The development and use of supersonic aircraft involve complex engineering challenges, particularly concerning noise (sonic booms), fuel efficiency, and environmental impact. Therefore, the correct answer to the given question is; option [C] at more than the speed of sound.
See lessThe velocity of sound in air
The velocity of sound in air is significantly influenced by temperature. As the temperature increases, the speed of sound in air also increases. This happens because warmer air causes air molecules to gain more kinetic energy, which makes them vibrate and collide more quickly, facilitating faster trRead more
The velocity of sound in air is significantly influenced by temperature. As the temperature increases, the speed of sound in air also increases. This happens because warmer air causes air molecules to gain more kinetic energy, which makes them vibrate and collide more quickly, facilitating faster transmission of sound waves. Conversely, as the temperature decreases, the speed of sound decreases because the air molecules have less kinetic energy, resulting in slower vibrations and collisions. The relationship between temperature and the speed of sound can be quantified using the formula:
v = 331.3 + 0.6 x T
where 𝑣 is the speed of sound in meters per second and 𝑇 is the temperature in degrees Celsius. Hence, colder temperatures lead to a slower speed of sound. Therefore, the correct answer is; option [D] decreases with decreasing temperature.
See lessIn which medium will the speed of sound be maximum at a temperature of about 20 °C?
The speed of sound varies significantly across different mediums due to differences in density and elasticity. In general, sound travels fastest in solids, followed by liquids, and slowest in gases. This is because molecules in solids are more tightly packed and can transmit vibrations more efficienRead more
The speed of sound varies significantly across different mediums due to differences in density and elasticity. In general, sound travels fastest in solids, followed by liquids, and slowest in gases. This is because molecules in solids are more tightly packed and can transmit vibrations more efficiently.
At approximately 20 °C, the speed of sound in air is around 343 meters per second, in water it is about 1,480 meters per second, in granite it ranges from 5,000 to 6,000 meters per second, and in iron, it is approximately 5,120 meters per second. Among these, the speed of sound is highest in solids like granite and iron due to their dense molecular structure.
Between granite and iron, iron typically exhibits slightly higher speeds due to its material properties. Thus, at 20 °C, the speed of sound is maximum in; option [D] Iron.
See lessThe velocity of sound in different mediums
The velocity of sound depends on the medium through which it travels, varying significantly across gases, liquids, and solids. In solids, the molecules are closely packed, which allows sound waves to travel more efficiently and rapidly. Therefore, the speed of sound is highest in solids. In liquids,Read more
The velocity of sound depends on the medium through which it travels, varying significantly across gases, liquids, and solids. In solids, the molecules are closely packed, which allows sound waves to travel more efficiently and rapidly. Therefore, the speed of sound is highest in solids. In liquids, the molecules are less tightly packed than in solids but more so than in gases, resulting in a moderate speed of sound. In gases, the molecules are farthest apart, causing the slowest transmission of sound waves.
For instance, at room temperature, the speed of sound in air (a gas) is approximately 343 meters per second, in water (a liquid) it is about 1,480 meters per second, and in steel (a solid), it is around 5,960 meters per second. This illustrates the trend of increasing sound velocity from gases to liquids to solids. Thus, the correct answer is; option [B] Varies and is highest in solid.
See lessSound waves travel at the fastest speed in
Sound waves travel at different speeds depending on the medium. In solids, sound waves travel the fastest because the molecules are tightly packed, allowing for efficient transmission of vibrations from one molecule to the next. This close proximity facilitates rapid propagation of sound waves. In lRead more
Sound waves travel at different speeds depending on the medium. In solids, sound waves travel the fastest because the molecules are tightly packed, allowing for efficient transmission of vibrations from one molecule to the next. This close proximity facilitates rapid propagation of sound waves. In liquids, the molecules are less densely packed than in solids, resulting in slower sound transmission. In gases, the molecules are spaced far apart, causing the slowest speed of sound as the vibrations take longer to travel from one molecule to another. In a vacuum, there are no molecules to transmit sound, so sound waves cannot travel at all.
For example, at room temperature, sound travels at about 343 meters per second in air (a gas), approximately 1,480 meters per second in water (a liquid), and around 5,960 meters per second in steel (a solid). Hence, the correct answer is; option [A] In solids.
See lessThe speed of sound in air is approximately
The speed of sound in air is influenced by temperature and atmospheric conditions. At room temperature, which is typically considered to be around 20°C (68°F), the speed of sound is approximately 343 meters per second (m/s). This speed decreases with lower temperatures and increases with higher tempRead more
The speed of sound in air is influenced by temperature and atmospheric conditions. At room temperature, which is typically considered to be around 20°C (68°F), the speed of sound is approximately 343 meters per second (m/s). This speed decreases with lower temperatures and increases with higher temperatures. The variations are relatively small in everyday conditions. Given the options, 330 m/s is the closest to the actual speed of sound in air at room temperature. Accurate knowledge of the speed of sound is crucial for various applications, including aviation, acoustics, and meteorology. While precise values might be needed for scientific calculations, an approximation of 330 m/s is often sufficient for general purposes. Therefore, the correct answer is; option [A] 330 m/s.
See lessThunder is heard long after the flash of lightning. The reason for this is
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 3Read more
The reason thunder is heard long after the flash of lightning is; option [D] The speed of light is much greater than the speed of sound. Lightning, which causes thunder, emits light that travels at a speed of approximately 300,000,000 meters per second, much faster than the speed of sound at about 343 meters per second in air. Consequently, the flash of lightning is seen almost instantly, while the sound of thunder takes longer to reach observers due to its slower propagation speed.
This delay allows us to estimate the distance of a lightning strike by counting the seconds between seeing the lightning and hearing the thunder (since sound travels approximately 1 kilometer in 3 seconds). The phenomenon underscores the fundamental difference in speed between light and sound waves, influencing how we perceive and interpret distant events like thunderstorms. Therefore, the correct answer explaining the delay is [D] The speed of light is much greater than the speed of sound.
See lessSound travels fastest through which of the following substances
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance andRead more
Sound travels fastest through; option [A] Steel. The speed of sound in a material depends on its elasticity and density. Steel, being a dense and highly elastic solid, allows sound waves to propagate at speeds faster than in air, water, or vacuum. In steel, sound waves encounter less resistance and can travel efficiently through its solid structure, making it useful in applications where rapid transmission of sound is necessary, such as in buildings, bridges, and machinery.
In contrast, sound travels much slower in air, water, and vacuum due to differences in their molecular structures and densities. Air, for example, has low density and elasticity compared to solids like steel, resulting in a slower speed of sound propagation. Therefore, among the substances listed, steel is the material through which sound travels the fastest due to its favorable acoustic properties.
See lessThe speed of sound in air is 332 meters per second. If the pressure is increased to double then the speed of sound will be
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationshRead more
If the pressure is doubled, the speed of sound in air remains; option [B] 332 m/sec. The speed of sound in a gas like air is primarily determined by its temperature. Under normal atmospheric conditions, changes in pressure do not significantly alter the speed of sound. This is because the relationship between pressure and the speed of sound in gases is indirect and complex, with temperature having a more pronounced effect on the density and elasticity of the medium.
In practical terms, doubling the pressure in air at a constant temperature does not double the speed of sound. It would require extreme changes in pressure or modifications in temperature to significantly alter the speed of sound in air. Thus, under the conditions given, the correct answer remains [B] 332 m/sec, reflecting the stability of the speed of sound in air under varying pressure conditions within normal ranges.
See less