Fig. 6.1 depicts a girl positioned a few hundred metres ahead of a large building. She operates a signal generator together with a loudspeaker to produce a brief pulse of sound directed at the building. The sound frequency is 3700 Hz. After a short interval, the girl hears an echo.
(a)[1]
State what is meant by the term echo.
(b(i))[1]
The echo has the same pitch as the original sound, but it is less loud. State what has happened to the amplitude of the sound wave.
(b(ii))[1]
State what has happened to the frequency of the sound wave.
(c)[2]
The speed of sound in air is $330\,\text{m s}^{-1}$. Calculate the wavelength of this sound.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Reflection of sound waves” …