WAEC Physics 2015 Objective — Question 30
Question 30 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.
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A girl standing some distance from the foot of a tall cliff claps her hands and hears the echo 0.8 s later. Calculate her distance from the cliff. [Speed of sound in air = 320 ms⁻¹]
- A. 82 m
- B. 102 m
- C. 128 mCorrect
- D. 140 m
Explanation
Distance = (speed × time)/2 = (320×0.8)/2 = 128 m.
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