waec model questions vol1 2021 physics
Objective • Question 17
Question 17
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A source emits a sound of frequency 800 Hz in air. An observer moves directly towards the stationary source with a speed of 30 m s⁻¹ and measures the frequency as 860 Hz. The speed of sound in air varies with temperature according to v = 331 + 0.6 T (where T is in °C). Determine the air temperature.
Answer Options
A.
130
B.
125
Correct Answer
C.
115
D.
105
Correct Answer
C
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