Tag: effects of light

Quizzes (3) Questions (91)

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

Rising and setting sun appears to be reddish because:

  1. The sun is colder at sunrise or at sunset

  2. Diffraction sends red rays to the earth at these times

  3. Refraction is responsible for it

  4. Scattering due to dust particles and air molecules is responsible for it
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Rayleigh's law of scattering, amount of scattering $\alpha \frac {1}{\lambda^4}$.
Red having maximum wavelength straight to the observer.
Most of the scattered light goes towards the sky, so 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

The process of re-emission of absorbed light in all directions with different intensities by the atom or molecule is called ____________.

  1. Scattering of light

  2. Dispersion of light

  3. Reflection of light

  4. Refraction of light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Scattering$ is the process of absorbed light in all possible directions with different intensities and frequency by an atom or a molecule.


Answer-(A)

Multiple choice physics energy production scattering of light and its applications some natural phenomena of light effects of light

A beam of monochromatic light first travels through glass of R.I. $1.5$ and then through water (R.I. $=\dfrac{4}{3}$). If the difference in their wavelengths in the two media is $40$nm, then the wavelength of the monochromatic light in vacuum will be?

  1. $4000\overset{o}{A}$
  2. $4400\overset{o}{A}$
  3. $4800\overset{o}{A}$
  4. $5200\overset{o}{A}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The wavelength in a medium is lambda_m = lambda_0 / n. We are given lambda_water - lambda_glass = 40 nm, which translates to lambda_0 * (3/4 - 2/3) = 40 nm. Solving this gives lambda_0 * (1/12) = 40 nm, resulting in lambda_0 = 480 nm, which equals 4800 Angstroms.

Multiple choice physics human eye and colourful world scattering of light and its applications some natural phenomena of light effects of light

One can not see through fog because:

  1. fog absorbed light

  2. light is scattered by the droplets in fog

  3. light surfers total reflection by the droplets in the fog

  4. the refractive index of fog is in infinity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We can not see clearly through fog because the light is scattered by the droplets in the fog. The light is scattered by very small particles, this phenomenon is called Tyndall effect.

Hence the option B is the right answer

Multiple choice physics human eye and colourful world scattering of light and its applications some natural phenomena of light effects of light

The rising and setting of sun appear red because of : 

  1. refraction

  2. reflection

  3. defraction

  4. scattering
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reddish appearance of the sun at sunrise or sunset is due to scattering of light by the molecules of air and other fine particles in the atmosphere.


Hence the option D is the right answer

Multiple choice physics the human eye and the colourful world scattering of light and its applications some natural phenomena of light effects of light

CV Raman got the Nobel Prize for his experiment on :

  1. Dispersion of Light

  2. Reflection of Light

  3. Deflection of Light

  4. Scattering of Light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

C. V. Raman got noble prize for his free, transparent sample of a chemical compound, a small fraction of the light emerges in directions other than that of the incident (incoming) beam. Here it is all about scattering of light.

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

In Raman effect, the wavelength of the incident radiation is $5890\overset{o}{A}$. The wavelengths of Stocks and anti-stocks lines are respectively.

  1. $5880\overset{o}{A}$ and $5900\overset{o}{A}$
  2. $5900\overset{o}{A}$ and $5880\overset{o}{A}$
  3. $5900\overset{o}{A}$ and $5910\overset{o}{A}$
  4. $5870\overset{o}{A}$ and $5880\overset{o}{A}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Incident wavelength=$5890 A^{0}$

  • Stocks  lines have wavelength more than the incident radiation
$\lambda _{s}>$ incident wavelength
  • Anti stocks lines have wavelength less than incident radiation
$\lambda _{as}<$ incident wavelength
So the correct option is B