Tag: effects of light

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Questions Related to effects of light

Multiple choice physics effects of light scattering of light and its applications some natural phenomena of light natural phenomena explained by scattering

As the thickness of the atmosphere increases colour of scattered light is found in ________ order.

  1. Blue, violet, yellow, red

  2. Violet, blue, yellow, red

  3. Red, yellow, blue, violet

  4. Violet, blue, red, yellow
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The short-wavelength blue and violet are scattered by molecules in the air much more than other colors of the spectrum because of which blue and violet light reaches our eyes from all directions.

As thickness of atmosphere increase,  more molecules are available to scatter the violet and blue light away from our eyes. If the path is long enough, all of the blue and violet light scatters out of our line of sight.  and he other colors orange, red continue on their way to your eyes.
The sky often appears red because larger particles of dust, pollution, and water vapor in the atmosphere reflect and scatter more of the reds and yellows.
Option D 

Multiple choice physics effects of light scattering of light and its applications some natural phenomena of light natural phenomena explained by scattering

The clear sky appears blue because:

  1. blue light gets absorbed in the atmosphere.

  2. ultraviolet radiations are absorbed in the atmosphere.

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

  4. light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The scattering of light depends on the size of the dust particles and the wavelength of the light. The amount of scattering is inversely proportional to the fourth power of wavelength.
Since, violet and blue lights get scattered more than lights of all other colours by the atmosphere the sky appears blue.

Multiple choice physics effects of light scattering of light and its applications some natural phenomena of light natural phenomena explained by scattering

What are the colours of the Sun observed most during sunrise/sunset and noon? 

  1. white and red

  2. reddish and orange

  3. yellow and reddish

  4. orange and blue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During sunrise and sunset the sun rays have to pass through a larger distance and also a greater thickness of air since it is low in the sky. At these positions, the sky looks orange-red colour because photons of red and orange light are least scattered through the atmosphere and are able to reach our eyes.

Multiple choice physics effects of light scattering of light and its applications some natural phenomena of light natural phenomena explained by scattering

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

  1. Dispersion of light

  2. Scattering of light

  3. Total internal reflection of light

  4. Reflection of light from the earth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We see red colour of the sun at sunrise or sunset as the sun at horizon and light rays need to travel a greater distance. In the process of scattering, violet, blue and green rays in the original sunlight are removed and the transmitted beam has yellow and red dominant.

Multiple choice physics effects of light scattering of light and its applications some natural phenomena of light natural phenomena explained by scattering

Tyndall effect is applicable when?

  1. The diameter of the dispersed particle is not much smaller than the wavelength of the light used

  2. The diameter of the dispersed particles is much smaller than the wavelength of the light used

  3. The refractive indices of the dispersed phase and the dispersion medium must be same

  4. The refractive indices of the dispersed phase and the dispersion medium must differ greatly in magnitude
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Tyndall effect occurs when light is scattered by particles in a colloid or fine suspension. This phenomenon is most pronounced when the size of the particles is comparable to the wavelength of the incident light.

Multiple choice physics effects of light scattering of light and its applications some natural phenomena of light natural phenomena explained by scattering

Which of the following statements is correctregarding the propagation of light of differentcolours of white light in air?

  1. Red light moves fastest

  2. Blue light moves faster than green light

  3. All the colours of the white light move with the same speed in empty space

  4. Yellow light moves with the mean speed as that of the red and the violet light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a vacuum or empty space, all electromagnetic waves, including all colors of visible light, travel at the same constant speed (the speed of light, c).