Question

Interference takes place whenever two or more wave motions combine in space. (True or False)
(A) True
(B) False

Answer 1

Interference is the combination of two waves.
One of the main conditions for an interference to occur is the need of a monochrome source.
The interaction of waves that are correlated or coherent with each other.

Complete step by step answer:
Consider two waves that propagate through a single medium that is of same medium. There are chances that these waves will superimpose each other. That is, there are chances that the et two waves get combine with each other or completely travel along different paths without any superposition. This depends on the wavelength and the phase difference between the waves. Although the waves interfere with each other when they meet, they continue travelling as if they had never encountered each other.

If these two waves meet each other then it is said that interference had occurred there. This may result in a new wave with new wave characteristics and of particle features of the net effect of the two waves that underwent the interference.

Based on the mode of interference, there are two types: constructive and destructive interference. When the displacement is in the same direction the constructive interference occurs. When the displacement is in the opposite direction, the destructive interference occurs.

These all are possible only if they are from a monochromatic source. Interference usually refers to the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency.

Therefore the statement “Interference takes place whenever two or more wave motions combine in space” is false.

So, the correct answer is “Option B”.

Note:
The peaks combine with peaks and the trough with other troughs in the constructive interference.
The destructive interference features, the combination of one peak with another trough.
In a new wave with new wave characteristics and of particle features of the net effect of the two waves that underwent the interference.