Waves are emitted from two coherent sources.Which statement about the waves must be correct?A They are in phase.B They are transverse waves.C They have a constant phase difference.D They have the same amplitude.
Question
Waves are emitted from two coherent sources.Which statement about the waves must be correct?A They are in phase.B They are transverse waves.C They have a constant phase difference.D They have the same amplitude.
Solution
The correct statement about the waves emitted from two coherent sources is that they have a constant phase difference.
Here's why:
A. They are in phase: This is not necessarily true. Coherent sources are sources with a constant phase difference. They could be in phase (phase difference of 0) or out of phase (phase difference of 180 degrees), or anywhere in between, as long as the phase difference is constant.
B. They are transverse waves: This is not necessarily true. Coherence is a property that can apply to any type of wave, not just transverse waves. Longitudinal waves can also be coherent.
C. They have a constant phase difference: This is true. By definition, coherent sources are sources that maintain a constant phase difference.
D. They have the same amplitude: This is not necessarily true. Coherence refers to the phase difference between waves, not their amplitudes. Two waves can be coherent without having the same amplitude.
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