The loudspeaker in Fig. 6.1 emits a sound whose frequency is $800\,\text{Hz}$.
(a)[2]
State what is meant by the term ‘frequency’.
(b)[1]
Explain whether the sound from the speaker can be heard by a human with healthy hearing.
(c)[3]
Describe the motion of the cone in Fig. 6.1 and explain how this leads to sound being produced.
(d)[2]
Explain why sound from explosions on the Sun’s surface does not reach Earth.
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