Reading Comprehension:- Read the passage and answer the questions that follow. 5 Sunset When the air is clear, the sunset will appear yellow, because the light from the sun has passed a long distance through air and the blue light has been scattered away. If the air is polluted with small particles, natural or otherwise, the sunset will be more red. Sunsets over the sea may also be orange, due to salt particles in the air. The sky around the sun is seen reddened, as well as the light coming directly from the sun. This is because all light is scattered relatively well through small angles, but blue light is then more likely to be scattered twice over the greater distances, leaving the yellow, red and orange colors. 1. As it is pointed out in the passage, the color of the sunset ----. a .may be lighter than expected due to salt particles in the air b. is red if the sky is clear c. owes its blueness to the distance between the sun and the earth d. is a combination of all the colors e. depends on the weather conditions and the location where it takes place 2. One can infer from the passage that the sunset looks yellow because ----. a. scattering does not play an appreciable role in determining the color of the transmitted light b. the blue light is scattered on the long way through the air at that time c. the light coming directly from the sun is blue d. air is polluted to such a degree that the Earth's climate is actually changing e. sunsets generally take place on the sea 3. As it is pointed out in the passage, ---- a. our eyes are more sensitive to light with blue frequencies b. the red light passes easily through the air without scattering at all c. when the sun sets, only the blue light is left d. the sunset is likely to look orange when small particles, such as salt from sea spray, are in the air e. by the time the light from a sunset gets to you, only red light
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Reading Comprehension:- Read the passage and answer the questions that follow. 5 Sunset When the air is clear, the sunset will appear yellow, because the light from the sun has passed a long distance through air and the blue light has been scattered away. If the air is polluted with small particles, natural or otherwise, the sunset will be more red. Sunsets over the sea may also be orange, due to salt particles in the air. The sky around the sun is seen reddened, as well as the light coming directly from the sun. This is because all light is scattered relatively well through small angles, but blue light is then more likely to be scattered twice over the greater distances, leaving the yellow, red and orange colors. 1. As it is pointed out in the passage, the color of the sunset ----. a .may be lighter than expected due to salt particles in the air b. is red if the sky is clear c. owes its blueness to the distance between the sun and the earth d. is a combination of all the colors e. depends on the weather conditions and the location where it takes place 2. One can infer from the passage that the sunset looks yellow because ----. a. scattering does not play an appreciable role in determining the color of the transmitted light b. the blue light is scattered on the long way through the air at that time c. the light coming directly from the sun is blue d. air is polluted to such a degree that the Earth's climate is actually changing e. sunsets generally take place on the sea 3. As it is pointed out in the passage, ---- a. our eyes are more sensitive to light with blue frequencies b. the red light passes easily through the air without scattering at all c. when the sun sets, only the blue light is left d. the sunset is likely to look orange when small particles, such as salt from sea spray, are in the air e. by the time the light from a sunset gets to you, only red light
1. (D) is contingent upon the climate and the setting in which it occurs.
2. (B) At that time, the blue light is dispersed across a wide area through the air.
3. (D) When there are minute particles in the air, such as salt from sea spray, the sunset is likely to seem orange.
- The Sun is quite low in the sky during sunrise and sunset, so the light we see has passed through a much thicker layer of atmosphere.
- Blue light tends to be dispersed multiple times and redirected in different ways before it reaches us because it is more heavily scattered by the atmosphere.
- This indicates that there is still a fair amount of yellow and red light available for our vision.
- The illustration below demonstrates how less atmosphere is present during the midday hours.
- We see blue sunlight because it is distributed widely as it enters the atmosphere of Earth.
- Due to the shorter, smaller waves that blue uses to travel, it scatters more than other colours.
- At sunset, though, light must travel farther through the atmosphere.
- As sunlight travels a greater distance, the shorter wavelength of blue light is widely diffused, allowing us to perceive the longer wavelength of yellow and red light.
- Rayleigh Scattering is a result of these consequences.
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