waec model questions vol1 2019 physics
Objective • Question 9
Question 9
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A source emits sound of frequency 500 Hz and moves towards a stationary observer at 30 m s⁻¹. Simultaneously the observer moves towards the source at 20 m s⁻¹. If the speed of sound in air is 340 m s⁻¹, what frequency does the observer hear? Give your answer to the nearest hertz.
Answer Options
A.
600
Correct Answer
B.
581
C.
540
D.
560
Correct Answer
B
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