Why is the Color of Clear Sky Blue

Q.

To an astronaut in a space -ship, the earth appears :

(a) white (b) red

(c) blue (d) black

Q.

For passengers flying at very high altitude, sky appears dark. Why?

1. Because blue light bends more than red light at very high altitudes

2. Because at very high altitude, scattering is not prominent

3. Because red is least scattered by fog or smoke

4. Because blue light is not able to reach human eyes

Q.

How would the sky appear when seen from the space (or moon) ? Give reason for your answer.

Q. Instead of all 7 colours (violet, indigo, blue, green, yellow, orange, red) if the sun only emits green, yellow, orange and red, what would be the possible colour of the sky?

1. Green
2. Black
3. Blue
4. Red

Q.

Question 10
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

(a) Dispersion of light
(b) Scattering of light
(c) Total internal reflection of light
(d) Reflection of light from the earth

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.

At very high altitude, the sky appears dark. Why?

1. Because red is least scattered by fog or smoke

2. Because at very high altitude, scattering is not prominent

3. Because blue light is not able to reach human eyes

4. Because blue light bends more than red light at very high altitudes

Q.

The colour of sky, in direction other than of the sun, is blue. Explain.

Q. Question 7
The clear sky appears blue because

(a) blue light gets absorbed in the atmosphere
(b) ultraviolet radiations are absorbed in the atmosphere
(c) violet and blue lights get scattered more than lights of all other
colours by the atmosphere
(d) light of all other colours is scattered more than the violet and
blue colour lights by the atmosphere

Q. Why does the clear sky appear blue ?

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. None of these

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

4. Because all colours scatters

Q.

For passengers flying at very high altitude, the sky appears dark. Why?

1. Because red is least scattered by fog or smoke

2. Because blue light bends more than red light at very high altitudes

3. Because blue light is not able to reach human eyes

4. Because at very high altitude, scattering is not prominent

Q.

Danger signals use ___colored light.

1. Because red light scatters the least

2. Because red light scatters the most

3. None of these

4. Because red light undergoes total internal reflection

Q.

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

1. Size of the scattering particle

2. Colour of scattering particle

3. Temperature of the scattering particle

4. Both temperature and size of the particles

Q.

For passengers flying at very high altitude, the sky appears dark. Why?

1. Blue light bends more than red light at very high altitude.

2. At very high altitude, scattering is not prominent.

3. Red light is least scattered by fog or smoke.

4. Blue light is not able to reach human eyes.

Q.

Which of the following colour scatters the least?

1. violet

2. red

3. blue

4. yellow

Q.

The clear sky appears blue because

1. ultraviolet radiations are absorbed in the atmosphere.

2. light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

3. blue light gets absorbed in the atmosphere.

4. violet and blue lights get scattered more than lights of all other colours by the atmosphere.

Q. Why is the colour of the ambulance siren red?

1. Red colour is more catchy.
2. Red colour is the colour of emergency.
3. Red colour scatters less.
4. Red light does not refract at all.

Q.

The blue color of the sky is due to ___

1. reflection of light

2. refraction of light

3. scattering of light

4. diffraction 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. None of these

4. beacuse no scattering happens

Q. The colour of the chromosphere is:

1. Red
2. White
3. Yellow
4. Pink