1. Why stars twinkle?
2. Why sun rises early sets late?
3. Why sky blue?
4. Why stars appear higher than actual position?
5. Why sun appears red in dusk and dawn?
6. Why danger signals are red in color?
Answers
Answer:
The answer of your all questions is same. Atmospheric Refraction.
Answer:
1. because of the effects of our atmosphere. When starlight enters our atmosphere it is affected by winds in the atmosphere and by areas with different temperatures and densities. This causes the light from the star to twinkle when seen from the ground.
2. Basically, when the North Pole is pointing towards the Sun, the northern hemisphere experiences summer and the southern hemisphere experiences winter. During the summer, the climate warms up and the sun appears earlier in the morning sky and sets at a later hour in the evening.
3. Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time. ... Also, the surface of Earth has reflected and scattered the light.
4. Stars appear higher than the actual position due to the refraction of light. The starlight suffers refraction continuously on entering the earth's atmosphere. Hence, it appears higher than actually it is. Star are the self illuminous object.
5. During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.
6. The primary reason why the color red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a color. ... So red light is able to travel the longest distance through fog, rain, and the alike.
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