Which of the following statements is true?
A)When two harmonic waves of the same frequency and wavelength but differing in phase combine,the resultant wave is a harmonic wave whose amplitude depends on the phase difference.
B)A phase difference between two waves can be the result of a difference in path length.
C)A path difference of one wavelength is equivalent to no phase difference at all.
D)A phase difference between two waves can be the result of reflection from a boundary surface.
E)All of these are correct.

Question

Quizplus · Accepted Answer

All of the statements are true. 
A) When two harmonic waves of the same frequency and wavelength but differing in phase combine, the resultant wave is a harmonic wave whose amplitude depends on the phase difference. This is known as interference.
B) A phase difference between two waves can be the result of a difference in path length. This is because one wave may have to travel a longer distance than the other to reach a certain point.
C) A path difference of one wavelength is equivalent to no phase difference at all. This is because one complete wavelength corresponds to a complete cycle, and a phase shift of one cycle ultimately brings the wave back to its initial state.
D) A phase difference between two waves can be the result of reflection from a boundary surface. This is because the phase of the reflected wave may be shifted compared to the incident wave, depending on the nature of the boundary surface.

Which of the Following Statements Is True