WAEC Physics 2023 Objective — Question 9
Question 9 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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A sound of frequency 512 Hz reaches a listener 100 m away. If the sound travels in air at s.t.p, what is its wavelength? [speed of sound in air = 331 ms⁻¹]
- A. 0.195 m
- B. 0.646 mCorrect
- C. 1.550 m
- D. 5.120 m
Explanation
λ = v/f = 331/512 = 0.646 m.
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