Infrasound waves are characterized by frequencies that are less than 20 Hz, which is below the lower limit of human hearing. Humans can typically hear sounds in the range of 20 Hz to 20,000 Hz, and sounds with frequencies higher than this range are termed ultrasound. Infrasound can be produced by vaRead more
Infrasound waves are characterized by frequencies that are less than 20 Hz, which is below the lower limit of human hearing. Humans can typically hear sounds in the range of 20 Hz to 20,000 Hz, and sounds with frequencies higher than this range are termed ultrasound. Infrasound can be produced by various natural phenomena such as earthquakes, volcanic eruptions, and ocean waves, as well as by artificial sources including explosions, heavy machinery, and certain types of industrial equipment. These low-frequency sounds can travel long distances and penetrate through different mediums, making them useful in applications like monitoring geophysical events and studying animal communication. Because of their low frequency, infrasound waves are less attenuated by the medium they travel through, allowing them to be detected over large distances. Therefore, the correct answer regarding the frequency of infrasound waves is; option [A] Less than 20 Hz.
The correct statement regarding sound waves is ; option [C] At 0 °C their speed is 332 meters per second. Sound waves are longitudinal waves, characterized by compressions and rarefactions in the medium through which they travel. Due to their nature, they cannot be polarized; polarization is a propeRead more
The correct statement regarding sound waves is ; option [C] At 0 °C their speed is 332 meters per second. Sound waves are longitudinal waves, characterized by compressions and rarefactions in the medium through which they travel. Due to their nature, they cannot be polarized; polarization is a property of transverse waves, where the oscillations occur perpendicular to the direction of wave propagation. Additionally, sound waves require a medium (such as air, water, or solids) to travel and cannot propagate in a vacuum because there are no particles to transmit the wave energy. Therefore, the statement about their speed at 0 °C being 332 meters per second is accurate, reflecting the physical properties of sound wave propagation in air at that specific temperature. This speed can vary with changes in temperature, pressure, and medium properties. Hence, the correct answer is [C].
Sound waves are longitudinal waves; option [B], meaning they propagate through the oscillation of particles parallel to the direction of wave travel. These waves consist of alternating compressions and rarefactions, where particles in the medium are pushed closer together and then spread apart, respRead more
Sound waves are longitudinal waves; option [B], meaning they propagate through the oscillation of particles parallel to the direction of wave travel. These waves consist of alternating compressions and rarefactions, where particles in the medium are pushed closer together and then spread apart, respectively. This sequential particle movement transmits energy through the medium, allowing sound to travel.
Unlike transverse waves, which oscillate perpendicular to their direction of propagation (such as water waves or electromagnetic waves), longitudinal waves require a material medium (like air, water, or solids) to travel. In a vacuum, where no particles exist to vibrate, sound cannot propagate. The speed of sound varies depending on the medium, being faster in solids and slower in gases due to differences in particle density and elasticity.
Understanding the longitudinal nature of sound waves is crucial in fields such as acoustics, audio engineering, and various scientific applications, where controlling and manipulating sound waves is essential.
Railway tracks are banked on curves so that the required centripetal force can be obtained from the horizontal component of the train's weight; option [C]. This prevents the train from derailing by providing the necessary inward force to counteract the outward force experienced during curved motion.Read more
Railway tracks are banked on curves so that the required centripetal force can be obtained from the horizontal component of the train’s weight; option [C]. This prevents the train from derailing by providing the necessary inward force to counteract the outward force experienced during curved motion. It allows for safe and stable traversal of curves at higher speeds, as the banking angle is designed to match the curvature and speed of the trains. Option C correctly identifies this principle, highlighting the significance of utilizing the horizontal component of the train’s weight to maintain stability and prevent accidents on curved sections of railway tracks. This engineering technique optimizes safety and efficiency in railway transportation systems by ensuring that trains can navigate curves smoothly and securely, enhancing overall operational performance and passenger safety.
A cyclist bends while taking a turn to ensure that the center of gravity remains inside the base, preventing the bicycle from falling; option [B]. This action helps maintain stability by redistributing the rider's weight and aligning the forces acting on the bicycle, facilitating safe and controlledRead more
A cyclist bends while taking a turn to ensure that the center of gravity remains inside the base, preventing the bicycle from falling; option [B]. This action helps maintain stability by redistributing the rider’s weight and aligning the forces acting on the bicycle, facilitating safe and controlled maneuvering around the curve. Option B correctly identifies this principle, emphasizing the importance of keeping the center of gravity within the bicycle’s footprint to maintain balance and prevent toppling. By leaning into the turn, the cyclist adjusts their body position to counteract the centrifugal force generated during the turn, enabling smooth navigation without losing control or risking a fall. This technique is fundamental to safe and efficient cycling, allowing riders to negotiate curves confidently and maintain stability throughout their journey.
When a cyclist turns a corner, he leans inwards; option [B]. Leaning inwards helps the cyclist counteract the centrifugal force that pulls outward during the turn, thereby maintaining balance and stability. This technique allows for smoother and safer maneuvering around the corner by redistributingRead more
When a cyclist turns a corner, he leans inwards; option [B]. Leaning inwards helps the cyclist counteract the centrifugal force that pulls outward during the turn, thereby maintaining balance and stability. This technique allows for smoother and safer maneuvering around the corner by redistributing the rider’s weight and aligning with the direction of the turn. Leaning outwards would increase the risk of losing balance, while not leaning at all may result in instability and difficulty navigating the turn. Similarly, leaning forward or backward primarily affects the distribution of weight along the bike, but the crucial adjustment during a turn is the inward lean, which helps the cyclist maintain control and negotiate the curve effectively. Therefore, option B, leaning inwards, is the correct response regarding the cyclist’s behavior during a turn.
When milk is churned vigorously, cream separates from it due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the milk is churned, the container's rotation generates centrifugal force, causing denser milk particles to move towRead more
When milk is churned vigorously, cream separates from it due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the milk is churned, the container’s rotation generates centrifugal force, causing denser milk particles to move towards the outer edges while lighter cream particles move towards the center. This separation occurs because centrifugal force overcomes the gravitational force acting on the milk and cream particles. The denser milk particles experience a stronger outward force, pushing them towards the container’s edges, while the lighter cream particles move towards the center due to their lower density. This results in a distinct separation between the cream and milk components. Centrifugal force is essential in various separation processes, including cream separation in milk churning, because it facilitates the segregation of components based on their density differences. Therefore, option A, centrifugal force, accurately explains why cream separates from milk when churned vigorously.
When a bucket of water is rotated very fast in a vertical circle, the water does not fall from the bucket even at its highest position due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the bucket spins, centrifugal force puRead more
When a bucket of water is rotated very fast in a vertical circle, the water does not fall from the bucket even at its highest position due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the bucket spins, centrifugal force pushes the water outward, counteracting the gravitational force pulling the water downward. At the highest point of the bucket’s rotation, the centrifugal force is greater than the gravitational force, preventing the water from falling out. Option A correctly identifies this scenario: centrifugal force exceeds the weight of the water. This balance between centrifugal force and gravity keeps the water contained within the bucket throughout the circular motion. However, it is essential to note that this equilibrium is fragile, and if the rotational speed decreases or the centrifugal force weakens, the water may spill out due to gravitational pull. Therefore, centrifugal force’s dominance over gravity is crucial in maintaining the water’s position within the bucket during vertical circular motion.
The working principle of a washing machine is centrifugation; option [A]. During the spin cycle, the machine rapidly rotates the drum, creating centrifugal force. This force pushes water and detergent outwards from the clothes, effectively removing dirt and stains. The centrifugal motion also helpsRead more
The working principle of a washing machine is centrifugation; option [A]. During the spin cycle, the machine rapidly rotates the drum, creating centrifugal force. This force pushes water and detergent outwards from the clothes, effectively removing dirt and stains. The centrifugal motion also helps separate the water and detergent solution from the fabric, allowing it to be drained away. This process aids in the efficient cleaning of laundry by expelling dirt and soapy water from the clothing fibers. Option A, centrifugation, accurately represents this fundamental mechanism of washing machines, emphasizing the role of centrifugal force in achieving thorough cleaning results. By harnessing centrifugation, washing machines provide a practical and effective solution for household laundry needs, ensuring that clothes are cleaned efficiently and thoroughly. The application of centrifugal force enables washing machines to achieve high-performance cleaning, making them indispensable appliances in modern households worldwide. Therefore, centrifugation stands as the primary working principle behind the operation of washing machines, ensuring optimal cleanliness and hygiene for laundered items.
The reason for there being no atmosphere on the Moon is; option [D]. The escape velocity of gas molecules on it is less than their root mean square velocity. This means that gas molecules on the Moon can attain speeds greater than the escape velocity, allowing them to escape into space rather than rRead more
The reason for there being no atmosphere on the Moon is; option [D]. The escape velocity of gas molecules on it is less than their root mean square velocity. This means that gas molecules on the Moon can attain speeds greater than the escape velocity, allowing them to escape into space rather than remain bound by lunar gravity. As a result, the Moon lacks a significant atmosphere, unlike Earth, where the escape velocity is higher, allowing the atmosphere to be retained. Other factors such as proximity to Earth (option A), receiving sunlight (option B), and orbiting the Earth (option C) do not directly determine the presence or absence of an atmosphere on the Moon.
The frequency of infrasound waves is
Infrasound waves are characterized by frequencies that are less than 20 Hz, which is below the lower limit of human hearing. Humans can typically hear sounds in the range of 20 Hz to 20,000 Hz, and sounds with frequencies higher than this range are termed ultrasound. Infrasound can be produced by vaRead more
Infrasound waves are characterized by frequencies that are less than 20 Hz, which is below the lower limit of human hearing. Humans can typically hear sounds in the range of 20 Hz to 20,000 Hz, and sounds with frequencies higher than this range are termed ultrasound. Infrasound can be produced by various natural phenomena such as earthquakes, volcanic eruptions, and ocean waves, as well as by artificial sources including explosions, heavy machinery, and certain types of industrial equipment. These low-frequency sounds can travel long distances and penetrate through different mediums, making them useful in applications like monitoring geophysical events and studying animal communication. Because of their low frequency, infrasound waves are less attenuated by the medium they travel through, allowing them to be detected over large distances. Therefore, the correct answer regarding the frequency of infrasound waves is; option [A] Less than 20 Hz.
See lessWhich of the following statements is true for sound waves?
The correct statement regarding sound waves is ; option [C] At 0 °C their speed is 332 meters per second. Sound waves are longitudinal waves, characterized by compressions and rarefactions in the medium through which they travel. Due to their nature, they cannot be polarized; polarization is a propeRead more
The correct statement regarding sound waves is ; option [C] At 0 °C their speed is 332 meters per second. Sound waves are longitudinal waves, characterized by compressions and rarefactions in the medium through which they travel. Due to their nature, they cannot be polarized; polarization is a property of transverse waves, where the oscillations occur perpendicular to the direction of wave propagation. Additionally, sound waves require a medium (such as air, water, or solids) to travel and cannot propagate in a vacuum because there are no particles to transmit the wave energy. Therefore, the statement about their speed at 0 °C being 332 meters per second is accurate, reflecting the physical properties of sound wave propagation in air at that specific temperature. This speed can vary with changes in temperature, pressure, and medium properties. Hence, the correct answer is [C].
See lessThe nature of sound waves is
Sound waves are longitudinal waves; option [B], meaning they propagate through the oscillation of particles parallel to the direction of wave travel. These waves consist of alternating compressions and rarefactions, where particles in the medium are pushed closer together and then spread apart, respRead more
Sound waves are longitudinal waves; option [B], meaning they propagate through the oscillation of particles parallel to the direction of wave travel. These waves consist of alternating compressions and rarefactions, where particles in the medium are pushed closer together and then spread apart, respectively. This sequential particle movement transmits energy through the medium, allowing sound to travel.
Unlike transverse waves, which oscillate perpendicular to their direction of propagation (such as water waves or electromagnetic waves), longitudinal waves require a material medium (like air, water, or solids) to travel. In a vacuum, where no particles exist to vibrate, sound cannot propagate. The speed of sound varies depending on the medium, being faster in solids and slower in gases due to differences in particle density and elasticity.
Understanding the longitudinal nature of sound waves is crucial in fields such as acoustics, audio engineering, and various scientific applications, where controlling and manipulating sound waves is essential.
See lessFor what reason are railway tracks banked on their curves?
Railway tracks are banked on curves so that the required centripetal force can be obtained from the horizontal component of the train's weight; option [C]. This prevents the train from derailing by providing the necessary inward force to counteract the outward force experienced during curved motion.Read more
Railway tracks are banked on curves so that the required centripetal force can be obtained from the horizontal component of the train’s weight; option [C]. This prevents the train from derailing by providing the necessary inward force to counteract the outward force experienced during curved motion. It allows for safe and stable traversal of curves at higher speeds, as the banking angle is designed to match the curvature and speed of the trains. Option C correctly identifies this principle, highlighting the significance of utilizing the horizontal component of the train’s weight to maintain stability and prevent accidents on curved sections of railway tracks. This engineering technique optimizes safety and efficiency in railway transportation systems by ensuring that trains can navigate curves smoothly and securely, enhancing overall operational performance and passenger safety.
See lessWhy does a cyclist bend while taking a turn?
A cyclist bends while taking a turn to ensure that the center of gravity remains inside the base, preventing the bicycle from falling; option [B]. This action helps maintain stability by redistributing the rider's weight and aligning the forces acting on the bicycle, facilitating safe and controlledRead more
A cyclist bends while taking a turn to ensure that the center of gravity remains inside the base, preventing the bicycle from falling; option [B]. This action helps maintain stability by redistributing the rider’s weight and aligning the forces acting on the bicycle, facilitating safe and controlled maneuvering around the curve. Option B correctly identifies this principle, emphasizing the importance of keeping the center of gravity within the bicycle’s footprint to maintain balance and prevent toppling. By leaning into the turn, the cyclist adjusts their body position to counteract the centrifugal force generated during the turn, enabling smooth navigation without losing control or risking a fall. This technique is fundamental to safe and efficient cycling, allowing riders to negotiate curves confidently and maintain stability throughout their journey.
See lessWhen a cyclist turns a turn, he
When a cyclist turns a corner, he leans inwards; option [B]. Leaning inwards helps the cyclist counteract the centrifugal force that pulls outward during the turn, thereby maintaining balance and stability. This technique allows for smoother and safer maneuvering around the corner by redistributingRead more
When a cyclist turns a corner, he leans inwards; option [B]. Leaning inwards helps the cyclist counteract the centrifugal force that pulls outward during the turn, thereby maintaining balance and stability. This technique allows for smoother and safer maneuvering around the corner by redistributing the rider’s weight and aligning with the direction of the turn. Leaning outwards would increase the risk of losing balance, while not leaning at all may result in instability and difficulty navigating the turn. Similarly, leaning forward or backward primarily affects the distribution of weight along the bike, but the crucial adjustment during a turn is the inward lean, which helps the cyclist maintain control and negotiate the curve effectively. Therefore, option B, leaning inwards, is the correct response regarding the cyclist’s behavior during a turn.
See lessWhen milk is churned vigorously, why does cream separate from it?
When milk is churned vigorously, cream separates from it due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the milk is churned, the container's rotation generates centrifugal force, causing denser milk particles to move towRead more
When milk is churned vigorously, cream separates from it due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the milk is churned, the container’s rotation generates centrifugal force, causing denser milk particles to move towards the outer edges while lighter cream particles move towards the center. This separation occurs because centrifugal force overcomes the gravitational force acting on the milk and cream particles. The denser milk particles experience a stronger outward force, pushing them towards the container’s edges, while the lighter cream particles move towards the center due to their lower density. This results in a distinct separation between the cream and milk components. Centrifugal force is essential in various separation processes, including cream separation in milk churning, because it facilitates the segregation of components based on their density differences. Therefore, option A, centrifugal force, accurately explains why cream separates from milk when churned vigorously.
See lessWhen a bucket of water is rotated very fast in a vertical circle, then the water does not fall from the bucket even from its highest position, because
When a bucket of water is rotated very fast in a vertical circle, the water does not fall from the bucket even at its highest position due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the bucket spins, centrifugal force puRead more
When a bucket of water is rotated very fast in a vertical circle, the water does not fall from the bucket even at its highest position due to centrifugal force; option [A]. Centrifugal force is an apparent force that acts outward from the center of rotation. As the bucket spins, centrifugal force pushes the water outward, counteracting the gravitational force pulling the water downward. At the highest point of the bucket’s rotation, the centrifugal force is greater than the gravitational force, preventing the water from falling out. Option A correctly identifies this scenario: centrifugal force exceeds the weight of the water. This balance between centrifugal force and gravity keeps the water contained within the bucket throughout the circular motion. However, it is essential to note that this equilibrium is fragile, and if the rotational speed decreases or the centrifugal force weakens, the water may spill out due to gravitational pull. Therefore, centrifugal force’s dominance over gravity is crucial in maintaining the water’s position within the bucket during vertical circular motion.
See lessThe working principle of a washing machine is
The working principle of a washing machine is centrifugation; option [A]. During the spin cycle, the machine rapidly rotates the drum, creating centrifugal force. This force pushes water and detergent outwards from the clothes, effectively removing dirt and stains. The centrifugal motion also helpsRead more
The working principle of a washing machine is centrifugation; option [A]. During the spin cycle, the machine rapidly rotates the drum, creating centrifugal force. This force pushes water and detergent outwards from the clothes, effectively removing dirt and stains. The centrifugal motion also helps separate the water and detergent solution from the fabric, allowing it to be drained away. This process aids in the efficient cleaning of laundry by expelling dirt and soapy water from the clothing fibers. Option A, centrifugation, accurately represents this fundamental mechanism of washing machines, emphasizing the role of centrifugal force in achieving thorough cleaning results. By harnessing centrifugation, washing machines provide a practical and effective solution for household laundry needs, ensuring that clothes are cleaned efficiently and thoroughly. The application of centrifugal force enables washing machines to achieve high-performance cleaning, making them indispensable appliances in modern households worldwide. Therefore, centrifugation stands as the primary working principle behind the operation of washing machines, ensuring optimal cleanliness and hygiene for laundered items.
See lessWhat is the reason for there being no atmosphere on the Moon?
The reason for there being no atmosphere on the Moon is; option [D]. The escape velocity of gas molecules on it is less than their root mean square velocity. This means that gas molecules on the Moon can attain speeds greater than the escape velocity, allowing them to escape into space rather than rRead more
The reason for there being no atmosphere on the Moon is; option [D]. The escape velocity of gas molecules on it is less than their root mean square velocity. This means that gas molecules on the Moon can attain speeds greater than the escape velocity, allowing them to escape into space rather than remain bound by lunar gravity. As a result, the Moon lacks a significant atmosphere, unlike Earth, where the escape velocity is higher, allowing the atmosphere to be retained. Other factors such as proximity to Earth (option A), receiving sunlight (option B), and orbiting the Earth (option C) do not directly determine the presence or absence of an atmosphere on the Moon.
See less