Three statements about two progressive waves are listed. 1 The waves have the same frequency. 2 The waves have the same amplitude. 3 The waves are emitted with a constant phase difference. Which statements must be correct for the two waves to be coherent?
A.
1, 2 and 3
B.
1 and 2 only
C.
1 and 3 only
D.
2 and 3 only
Exam No：9702_w24_qp_11 Year：2024 Question No：27
Answer:
C
Knowledge points:
7.3.1 understand that when a source of waves moves relative to a stationary observer, there is a change in observed frequency
7.3.2 use the expression for the observed frequency when a source of sound waves moves relative to a stationary observer
7.3.3 appreciate that Doppler shift is observed with all waves, including sound and light
Solution:
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