Tag: superposition of waves

Questions Related to superposition of waves

Two coherent sources of light can be obtained by

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

  1. two different lamps

  2. two different lams of same power and same colour

  3. two different lamps of same power

  4. none of these

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Correct Option: D
Explanation:

Two sources are said to be coherent if they have exactly same frequency and have zero or constant phase difference. Two coherent source cannot be obtained from two different light sources.

Two light sources are said to be coherent if they are obtained from:

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

  1. two ordinary bulbs emitting light of different wavelengths

  2. a single point source

  3. a wide source

  4. two independent point sources emitting light of the same wavelength

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Correct Option: B

Interference occurs in which of the following waves?

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

  1. Transverse

  2. Electromagnetic

  3. Longitudinal

  4. All of these

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Correct Option: D
Explanation:

Since, interference occurs both in sound and light waves so it will occur in all the forms of waves given.

The sources which can give sustained interference are:

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

  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

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Correct Option: A
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.

In a Laser beam the photons emitted are :

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

  1. incoherent

  2. coherent

  3. of same velocity

  4. of same wavelength

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Correct Option: B
Explanation:

LASER refers to light amplification based on the stimulated emission of Radiation. It emits light coherently. Thus the photons emitted in a laser beam are coherent.

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

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

  1. identical waves

  2. incoherent waves

  3. coherent waves

  4. collateral waves

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Correct Option: C
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 .

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

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

  1. congruence

  2. coherence

  3. same intensity

  4. same amplitude

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Correct Option: B
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.

Interference of light from two sources can be observed if 

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

  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.

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Correct Option: D
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 .

Laser light is considered to be coherent because it consists of

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

  1. Many wavelengths

  2. Uncoordinated wavelengths

  3. Cooridnated waves of exactly the same wavelength

  4. Divergent beams

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Correct Option: C
Explanation:

Laser light is considered to be coherent because it consist of waves of exactly the same wavelength in phase.

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

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

  1. Have constant phase difference

  2. Be narrow

  3. Be close to each other

  4. Of same amplitude

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Correct Option: A
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.