waec model questions vol1 2019 physics
Objective • Question 24
Question 24
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A source emits sound of frequency \(f=500\ \text{Hz}\) and moves directly toward a stationary observer with a speed of \(30\ \text{m·s}^{-1}\). The speed of sound in still air is \(340\ \text{m·s}^{-1}\). Meanwhile a wind blows from the source toward the observer at \(10\ \text{m·s}^{-1}\). What frequency does the observer hear? (Round to the nearest hertz.)
Answer Options
A.
548
B.
530
Correct Answer
C.
547
D.
560
Correct Answer
C
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