A hammer drives a metal post into the ground, as shown in Fig. 9.1. When the hammer strikes the post, it produces a loud noise. A man is standing 160 m away from the hammer.
(a)[1]
A man sees the hammer strike the post and, after a short delay, hears the sound of the impact. Explain the delay in hearing the sound.
(b(i))[1]
The man hears the hammer strike the post and afterwards hears an echo. Explain why the echo is heard.
(b(ii))[3]
Calculate the interval between the man hearing the first sound and hearing the echo.
(c)[1]
Suggest in what way the echo sound differs from the original sound.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Light has a greater speed than sound (or reverse argument)” …