waec model questions vol1 2019 physics
Objective • Question 13
Question 13
WAEC_MODEL_QUESTIONS_VOL1
•
2019
Two tuning forks of frequencies 256 Hz and 260 Hz are placed 100 m apart along a straight line. An observer walks from the lower‑frequency fork toward the higher‑frequency fork at a speed of 10 m s⁻¹. If the speed of sound is 340 m s⁻¹, what beat frequency does the observer hear when he is exactly midway between the forks?
Answer Options
Correct Answer
A.
19
B.
21
C.
23
D.
15
Correct Answer
A
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