Scattering

Q.

Give reason: Danger signals are red in colour

Q.

___ color scatters the most since it has the smallest wavelength.

1. Red

2. Blue

3. Yellow
4. None of the above

Q.

The danger signals are red in colour because it is

1. strongly scattered by fog or smoke

2. strongly absorbed by fog or smoke

3. least scattered by fog or smoke

4. least absorbed by fog or smoke.

Q.

The colour of scattered light depends upon the size of the scattering particles.

1. True

2. False

Q.

The color of the sky is blue. Why?

Q.

The scattering of light by colloidal particles present in a colloidal solution is called ______

Q.

In a given direction, the intensities of the scattered light by a scattering substance for two beams of light are in the ratio of $256:81.$ The ratio of the frequency of the first beam to the frequency of the second beam is ?

1. $64:127$

2. $21:123$

3. $64:27$

4. None of these

Q.

Sun and sky appear to be red during sunset and sunrise because

1. Light scatters to a very small extent during sunset and sunrise

2. Light scatters to a very large extent during sunset and sunrise and hence longer wavelengths like red light are scattered out to a greater extent

3. Light scatters to a very large extent during sunset and sunrise and hence shorter wavelengths like red light are scattered out to a greater extent

4. Light travels through a large layer of atmosphere during sunset and sunrise and hence longer wavelengths like violet light are scattered out to a greater extent

5. Light travels through a large layer of atmosphere during sunset and sunrise and hence shorter wavelengths like violet light are scattered out to a greater extent

Q. Blue colour of sky is due to ___.

1. scattering of light
2. reflection of light
3. refraction of light
4. diffraction of light

Q.

When does the sky appear white and why?

Q.

Why sky is blue. Explain through the phenomenon of scattering of light .

Q.

State True or False:

The colour of scattered light depends upon the size of the scattering particles.

1. True

2. False

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. According to Rayleigh scattering law, the amount of scattering is

1. directly proportional to square of wavelength of light
2. independent of wavelength of light
3. directly proportional to wavelength of light
4. inversely proportional to fourth power of wavelength of light
5. inversely proportional to wavelength of light

Q.

Why is the sky blue ?

Q.

In which of the following, scattering of light does not takes place?

1. Blue colour of the sky

2. Colour of deep sea

3. Reddening of the sun

4. Rainbow

Q. A radioactive source emits three types of radiation.
a) When the alpha particle becomes neutral, it is found to be the atom of a rare gas. Name this rare gas and draw a model of its neutral atom.
b) From which part of the atom do these radiations come?

Q. Which of the following colours gets scattered the least?

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

Q. Assertion :Blue colour of sky appears due to scattering of light. Reason: Blue colour has shortest wavelength among all colours of white light.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Red colour scatters the most since it has smallest wavelength.

1. True

2. False

Q.

Name one effect produced by the scattering of light by the atmosphere.

Q. What is the Raman effect ?

Q. Assertion- A red object appears dark in theyellow light. Reason:- The red colour is scattered less.

Q. A plane glass slab is kept over various coloured letters, the letter which appears least raised is:

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

Q. In the scattering of light, the colour of light scattered depends on the colour of the particle.

1. True
2. False

Q. Electrons with de Broglie wavelength fall on the target in an X - ray tube. The cut-off wavelength of the emitted X - rays is

Q. Why does rising Sun appears red in colour?

Q. Explain the following:
i.) Out of blue and red light, which one is scattered more and why? [2 marks]
ii.) What is colour of danger signals? Why? [2 marks]

Q. Why does the sky appears blue?

Q. Amount of scattering is proportional to:
($\lambda :$ Wavelength, c: speed of light)

1. ${\lambda }^4$
2. ${\lambda }^{-4}$
3. $c{f}^4$
4. $c{f}^{-4}$