Tag: physics

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

Coherence is a measure of

  1. capability of producing interference by wave

  2. waves being diffracted

  3. waves being reflected

  4. waves being refracted
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interference is a phenomenon in which two waves superpose to form a resultant wave of greater or lower amplitude.

If the sources are coherent, the interference pattern obtained is more ordered, with definite spacing between fringes. 
Thus coherence is a measure of capability of producing interference of wave.

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

The phenomenon of interference is shown by:

  1. longitudinal mechanical waves only

  2. electromagnetic waves only

  3. transverse mechanical waves only

  4. all the above types of waves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All of the above type of waves.


Interference of a wave is the phenomenon that usually happens when the two waves reinforce,while travelling in the same medium. The interference of waves causes the medium to take on a shape that results from the net effects of the two individual waves simultaneously acting upon the particles of the medium.

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

Two coherent sources of light can be obtained by

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coherent sources are typically derived from a single point source (e.g., using a beam splitter or double slits) to ensure they share the same initial phase and frequency.

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 .