Tag: interference

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Questions Related to interference

Multiple choice physics superposition of waves coherence young's double slit experiment interference

The sources which can give sustained interference are:

  1. two independent laser sources

  2. two independent light bulbs

  3. two light sources of very large width

  4. two sources far away from one other
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Laser sources produce light waves which are coherent. As sustained interference takes place between waves, which are coherent, we can use two independent laser sources for the same.

Multiple choice physics superposition of waves coherence young's double slit experiment interference

Two waves having the same wavelength and amplitude but having a constant phase difference with time are known as :

  1. identical waves

  2. incoherent waves

  3. coherent waves

  4. collateral waves
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the light waves are emitted from a single source and they have a constant phase difference between them then the waves are said to be coherent.
Option C is correct .

Multiple choice physics superposition of waves coherence young's double slit experiment interference

Light waves spreading from two sources produce steady interference only if they have:

  1. congruence

  2. coherence

  3. same intensity

  4. same amplitude
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Interference refers to the interaction of waves that are correlated of coherent with each other. Sustained interference takes place between waves which are coherent.

Multiple choice physics superposition of waves coherence young's double slit experiment interference

Interference of light from two sources can be observed if 

  1. The sources are independent.

  2. The sources are of different frequencies and random phases.

  3. The sources are of different frequency.

  4. The sources are coherent.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Interference of light from two sources can be observed if the sources are coherent . It means that the phase difference between two sources must be constant with time . Two independent sources can't produce an interference pattern .

Multiple choice physics superposition of waves coherence young's double slit experiment interference

For the sustained interference of light, the necessary condition is that the two sources should:

  1. Have constant phase difference

  2. Be narrow

  3. Be close to each other

  4. Of same amplitude
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To obtain a well defined interference patterns, the intensity at points corresponding to destructive interference must be zero, while intensity at the point corresponding to constructive interference must be maximum. To accomplish this the necessary condition is that the two interference sources must be coherent, that is, they must keep a constant phase difference.

Multiple choice physics superposition of waves coherence young's double slit experiment interference

Interference pattern can be produced by two identical sources. Here the identical sources mean that

  1. their size is same

  2. their wavelength is same

  3. the intensity of light emitted by them is same

  4. the emplitudes of light waves emitted by them are same
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For observing interference the term identical source means that their wavelength are the same ( i.e., they are coherent).