Dry sand appears bright because it reflects more light, while wet sand appears darker due to the optical properties influenced by water. When sand is dry, light reflects off the individual sand grains, causing the sand to appear bright and shiny. When sand becomes wet, water fills the gaps between tRead more
Dry sand appears bright because it reflects more light, while wet sand appears darker due to the optical properties influenced by water. When sand is dry, light reflects off the individual sand grains, causing the sand to appear bright and shiny. When sand becomes wet, water fills the gaps between the sand grains, changing the way light interacts with the surface. The water reduces the amount of light reflected directly and increases the amount of light absorbed or refracted within the sand-water mixture. This results in less light being reflected back to the observer, making the wet sand appear darker and less bright. Therefore, the change in appearance is caused by refraction (C), where the water alters the light paths through the sand, reducing its overall brightness compared to dry sand.
The stars appear higher in the sky than they actually are due to atmospheric refraction (A). As starlight travels through the Earth's atmosphere, it passes through layers of varying density. When light moves from a less dense medium (space) into a denser medium (the atmosphere), it bends towards theRead more
The stars appear higher in the sky than they actually are due to atmospheric refraction (A). As starlight travels through the Earth’s atmosphere, it passes through layers of varying density. When light moves from a less dense medium (space) into a denser medium (the atmosphere), it bends towards the normal. This bending, or refraction, increases as the atmosphere’s density increases closer to the Earth’s surface. Because of this gradual bending, the path of the starlight is curved, causing the stars to appear at a higher position in the sky than their actual location. This effect is more pronounced when stars are near the horizon, as the light has to pass through a thicker layer of the atmosphere, resulting in more significant refraction. This phenomenon explains why stars and other celestial objects seem to be slightly displaced from their true positions.
In a rainbow, purple (A) is dispersed more. This is due to the phenomenon of dispersion, where different wavelengths of light refract at slightly different angles when passing through water droplets. Purple light, having a shorter wavelength, bends more than other colors such as red (which has a lonRead more
In a rainbow, purple (A) is dispersed more. This is due to the phenomenon of dispersion, where different wavelengths of light refract at slightly different angles when passing through water droplets. Purple light, having a shorter wavelength, bends more than other colors such as red (which has a longer wavelength). As a result, purple light is spread out more than the other colors, causing it to appear on the inner edge of the rainbow. The degree of bending, or refraction, increases with decreasing wavelength, which is why purple, being at the shorter end of the visible spectrum, is dispersed the most. This dispersion results in the separation of light into its constituent colors, creating the spectrum of a rainbow with purple on the inner edge and red on the outer edge.
The red color in the sky at sunrise and sunset is caused by scattering (C). When the sun is near the horizon, its light has to pass through a thicker layer of the Earth's atmosphere. This increased distance causes more scattering of shorter wavelengths (blue and violet) by air molecules and particleRead more
The red color in the sky at sunrise and sunset is caused by scattering (C). When the sun is near the horizon, its light has to pass through a thicker layer of the Earth’s atmosphere. This increased distance causes more scattering of shorter wavelengths (blue and violet) by air molecules and particles. As a result, the shorter wavelengths are scattered out of the direct line of sight, and the longer wavelengths (red and orange) become more prominent. This effect, known as Rayleigh scattering, is responsible for the reddish hues observed during these times of the day. The phenomenon is more pronounced when there are particles like dust or pollution in the atmosphere, enhancing the scattering and intensifying the red and orange colors.
The heat required to convert a substance from liquid to gas without any change in temperature is known as the latent heat of vaporization. This energy is absorbed by the substance during the phase transition from liquid to gas at its boiling point. At this point, the substance absorbs energy to overRead more
The heat required to convert a substance from liquid to gas without any change in temperature is known as the latent heat of vaporization. This energy is absorbed by the substance during the phase transition from liquid to gas at its boiling point. At this point, the substance absorbs energy to overcome intermolecular forces holding the liquid molecules together, allowing them to enter the gas phase.
The latent heat of vaporization is a critical concept in understanding processes such as boiling, where liquid turns into vapor. It is essential in various applications, including cooking, distillation, and climate science. Different substances have different latent heats of vaporization, depending on their molecular properties and intermolecular forces.
Therefore, the correct answer is [D] Vaporization, as it specifically refers to the phase transition from liquid to gas, accompanied by the absorption of heat energy without a change in temperature.
Why does dry sand appear bright, while wet sand is colourless?
Dry sand appears bright because it reflects more light, while wet sand appears darker due to the optical properties influenced by water. When sand is dry, light reflects off the individual sand grains, causing the sand to appear bright and shiny. When sand becomes wet, water fills the gaps between tRead more
Dry sand appears bright because it reflects more light, while wet sand appears darker due to the optical properties influenced by water. When sand is dry, light reflects off the individual sand grains, causing the sand to appear bright and shiny. When sand becomes wet, water fills the gaps between the sand grains, changing the way light interacts with the surface. The water reduces the amount of light reflected directly and increases the amount of light absorbed or refracted within the sand-water mixture. This results in less light being reflected back to the observer, making the wet sand appear darker and less bright. Therefore, the change in appearance is caused by refraction (C), where the water alters the light paths through the sand, reducing its overall brightness compared to dry sand.
See lessThe stars appear higher in the sky than they actually are. By what can this be explained?
The stars appear higher in the sky than they actually are due to atmospheric refraction (A). As starlight travels through the Earth's atmosphere, it passes through layers of varying density. When light moves from a less dense medium (space) into a denser medium (the atmosphere), it bends towards theRead more
The stars appear higher in the sky than they actually are due to atmospheric refraction (A). As starlight travels through the Earth’s atmosphere, it passes through layers of varying density. When light moves from a less dense medium (space) into a denser medium (the atmosphere), it bends towards the normal. This bending, or refraction, increases as the atmosphere’s density increases closer to the Earth’s surface. Because of this gradual bending, the path of the starlight is curved, causing the stars to appear at a higher position in the sky than their actual location. This effect is more pronounced when stars are near the horizon, as the light has to pass through a thicker layer of the atmosphere, resulting in more significant refraction. This phenomenon explains why stars and other celestial objects seem to be slightly displaced from their true positions.
See lessWhich colour is dispersed more in rainbow?
In a rainbow, purple (A) is dispersed more. This is due to the phenomenon of dispersion, where different wavelengths of light refract at slightly different angles when passing through water droplets. Purple light, having a shorter wavelength, bends more than other colors such as red (which has a lonRead more
In a rainbow, purple (A) is dispersed more. This is due to the phenomenon of dispersion, where different wavelengths of light refract at slightly different angles when passing through water droplets. Purple light, having a shorter wavelength, bends more than other colors such as red (which has a longer wavelength). As a result, purple light is spread out more than the other colors, causing it to appear on the inner edge of the rainbow. The degree of bending, or refraction, increases with decreasing wavelength, which is why purple, being at the shorter end of the visible spectrum, is dispersed the most. This dispersion results in the separation of light into its constituent colors, creating the spectrum of a rainbow with purple on the inner edge and red on the outer edge.
See lessWhat causes the red colour in the sky at the time of sunrise and sunset?
The red color in the sky at sunrise and sunset is caused by scattering (C). When the sun is near the horizon, its light has to pass through a thicker layer of the Earth's atmosphere. This increased distance causes more scattering of shorter wavelengths (blue and violet) by air molecules and particleRead more
The red color in the sky at sunrise and sunset is caused by scattering (C). When the sun is near the horizon, its light has to pass through a thicker layer of the Earth’s atmosphere. This increased distance causes more scattering of shorter wavelengths (blue and violet) by air molecules and particles. As a result, the shorter wavelengths are scattered out of the direct line of sight, and the longer wavelengths (red and orange) become more prominent. This effect, known as Rayleigh scattering, is responsible for the reddish hues observed during these times of the day. The phenomenon is more pronounced when there are particles like dust or pollution in the atmosphere, enhancing the scattering and intensifying the red and orange colors.
See lessThe heat required to convert a substance from liquid to gas without any temperature change is called latent heat of?
The heat required to convert a substance from liquid to gas without any change in temperature is known as the latent heat of vaporization. This energy is absorbed by the substance during the phase transition from liquid to gas at its boiling point. At this point, the substance absorbs energy to overRead more
The heat required to convert a substance from liquid to gas without any change in temperature is known as the latent heat of vaporization. This energy is absorbed by the substance during the phase transition from liquid to gas at its boiling point. At this point, the substance absorbs energy to overcome intermolecular forces holding the liquid molecules together, allowing them to enter the gas phase.
The latent heat of vaporization is a critical concept in understanding processes such as boiling, where liquid turns into vapor. It is essential in various applications, including cooking, distillation, and climate science. Different substances have different latent heats of vaporization, depending on their molecular properties and intermolecular forces.
Therefore, the correct answer is [D] Vaporization, as it specifically refers to the phase transition from liquid to gas, accompanied by the absorption of heat energy without a change in temperature.
See less