Scattering of Light

Q.

Sun appears red at sunrise and sunset. This is due to light having

shorter wavelengths gets scattered away.

longer wavelengths gets scattered away.

lower frequencies gets scattered away.

all frequencies gets scattered away.

Q.

The red colour is used in danger signal because it is more attractive and common.

1. True

2. False

Q.

What is meant by scattering of light ?

Q.

At noon the sun appears white as

1. light is least scattered

2. all the colours of the white light are scattered away

3. blue colour is scattered the most

4. red colour is scattered the most

Q.

The change in the diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will be

1. Diffracted image is not clear

2. Diffracted image gets dispersed into constituent colours of white light

3. The image of the slit becomes infinitely wide

4. Clear colourful fringe pattern

Q.

Blue colour of the sky is due to ___ of light.

Q.

Scattering of light causes the blue colour of sky and reddening of the Sun at the times of sunrise and sunset.

1. True

2. False

Q.

State Rayleighs law for scattering.

Q.

At sunrise or sunset, the sun looks reddish , because:

1. of the effects of reflection and refraction.

2. the sun is coldest at those times.

3. the sun is hottest at those times.

4. of the scattering of light.

Q.

Why do clouds appear white while sky appears blue?

1. Clouds scatter only blue light.

2. Clouds scatter all colours of light.

3. Clouds scatter only red light.

4. Clouds don't scatter light.

Q.

Why do the sky appears dark instead of blue to the astronauts?

Q. Which of the two is scattered more easily : light of shorter wavelengths or light of longer wavelengths ?

Q.

The sky appears dark to passengers flying at very high altitudes mainly because

1. A scattering of light is not enough at such heights.

2. There is no atmosphere at great heights.

3. The size of molecules is smaller than the wavelength of visible light.

4. The light gets scattered towards the earth.

Q.

Which of the following colour scatters the least?

1. violet

2. red

3. blue

4. yellow

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 is red light scattered the least?

Q.

In a spectrum, ____________________________ color bends the most, whereas __________________ color bends the least.

Q. Why does the sun appear red during mornings and evenings?

1. Red is scattered the most.
2. Red is scattered the least.
3. Each colour is scattered except red.
4. Only red is scattered.

Q.

Stars appear to twinkle when seen from the moon.

1. False

2. True

Q. What is the difference between diffraction and scattering of light?

Q.

The danger signal is red. Why?

Q.

Mention the Factor on Which the Scattering of Light depends. Why Does the Sky Appear Dark in Space?

Q.

Which colour of white light is scattered the least ? Give reason.

Q.

Which colour indicates the hottest surface temperature of a star?

1. Green

2. Yellow

3. Red

4. Blue

Q.

To an observer on Earth the stars appear to twinkle. This is due to

1. frequent absorption of star light by earth's atmosphere.

2. the fact that stars do not emit light continuously.

3. the fluctuation of physical conditions in the earth's atmosphere.

4. frequent absorption of star light by their own atmosphere.

Q. Why sun appears red during sunrise & sunset ?

Q.

Stars are only present in the sky during the night. True or false?

1. True

2. False

Q.

According to Rayleigh scattering, scattering of light is α $\frac{1}{{\lambda }^4}$ ?

1. True

2. False

Q.

The blue colour of the sky is due to ____ of light.

1. tyndall effect

2. refraction

3. dispersion

4. scattering

Q. What is selective scattering?