Waves $$\(P\)$$ and $$\(Q\)$$ have the same amplitude. The waves meet in phase at point $$\(X\)$$ and interfere to give a resultant wave with intensity $$\(I\)$$. The amplitude of wave $$\(P\)$$ is doubled. What is the new intensity of the resultant wave at X , in terms of $$\(I\)$$ ?
A.
\(0.44 I\)
B.
\(1.5 I\)
C.
2.3 I
D.
3.01
Exam No：9702_w24_qp_11 Year：2024 Question No：28
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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