Sunrise and Sunset

Q. Sun appears to be risen before the actual sunrise because of:

1. Scattering of light
2. Dispersion of light
3. Atmospheric refraction
4. Atmospheric reflection

Q.

What is atmospheric refraction and what causes atmospheric refraction?

Q. We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. Then how does light get refracted on passing through only air in the atmosphere ?

Q.

Why do stars appear to be twinkling?

Q.

Why does the sun appear yellowish-white during the noontime?

1. Because sunlight has to travel relatively shorter atmospheric distance.

2. Because sunlight has to travel longer atmospheric distance.

3. Because only red and violet are scattered.

4. Because all the colours are scattered by the cloud.

Q.

Sun appears red at sunrise and sunset. This is due to light having _________ getting scattered away.

1. longer wavelengths

2. shorter wavelengths

3. lower frequencies

4. all frequencies

Q.

Give any three phenomena that occur due to the refraction of light.

Q.

Why does sun appear yellowish-white at the noon?

1. Because sunlight has to travel relatively shorter atmospheric distance

2. Because sun light has to travel longer atmospheric distance

3. Because only red and violet are scattered

4. Because all the colours are scattered by the cloud

Q.

Which of the following points can be attributed as a reason for deviation of apparent position of a star from its actual position?

1. Stars are farther than the Sun

2. Starlight undergo refraction while entering atmosphere

3. Changing refractive index of atmosphere

4. Effect of moonlight