The displacement-distance graph for a transverse progressive wave is shown. The phase difference between points $$\(X\)$$ and $$\(Y\)$$ can be expressed as $$\((180 n)^{\circ}\)$$. What is the value of $$\(n\)$$ ?
A.
1.5
B.
2.5
C.
3.0
D.
6.0
Exam No：9702_s18_qp_13 Year：2018 Question No：20
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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