Why Is the Color of Clear Sky Blue

Q. Why does the sky appear blue from the earth's surface?

1. None of these.
2. When sunlight enters the atmosphere, fine air particles scatter blue colour more than red. The scattered blue light enters our eyes.
3. When sunlight enters the atmosphere, fine air particles scatter all the colours other than the blue colour thus the blue colour reaches our eyes.
4. When sunlight passes through the atmosphere, the blue light gets dispersed the most.

Q. What do you think, how does the sky look from the moon?

1. Orange all the time
2. Orange at sunrise and sunset
3. Blue
4. Black

Q.

Why does sky appears blue ?

1. Due to total internal reflection of light

2. Due to the mixture of hot air and cold air

3. Due to atmospheric refraction

4. Fine particles in the air scatter blue light more than red light

Q.

Blue colour of the sky is due to

1. Refraction of light

2. Reflection of light

3. Scattering of light

4. Dispersion of light

Q.

The above diagram shows the arrangement for observing scattering of light in colloidal solution. Why does the beaker appears blue ?

1. because of scattering of blue light only

2. because of scattering of red light

3. beacuse no scattering happens

4. None of these

Q.

The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appears orange red when seen through the slit MN ?

1. Because red light scatters the most

2. Because blue light scatters most and remaing colors passes unscattered

3. Because all colours scatters

4. None of these

Q.

Which of the following colour scatters the least?

1. blue

2. violet

3. yellow

4. red

Q.

In Tyndall effect, the colour of light that is scattered depends on:

1. Temperature of the scattering particle

2. Both temperature and size of the particles

3. Size of the scattering particle

4. Colour of scattering particle

Q.

Why are the danger signals coloured red?

1. Because red light scatters the most

2. None of these

3. Because red light undergoes total internal reflection

4. Because red light scatters the least

Q.

Red color is used in danger signal because it scatters to a wider angle.

1. True

2. False