A musician plays a note on an electronic keyboard. A listener notices that, although the pitch of the sound produced remains exactly the same, the loudness of the sound fluctuates periodically.
Which row in the table correctly describes the amplitude and the frequency of the sound wave?
amplitudefrequencyAvaryingconstantBconstantvaryingCconstantconstantDvaryingvarying \begin{array}{|c|c|c|} \hline & \text{amplitude} & \text{frequency} \\ \hline \text{A} & \text{varying} & \text{constant} \\ \hline \text{B} & \text{constant} & \text{varying} \\ \hline \text{C} & \text{constant} & \text{constant} \\ \hline \text{D} & \text{varying} & \text{varying} \\ \hline \end{array} ABCDamplitudevaryingconstantconstantvaryingfrequencyconstantvaryingconstantvaryingRow A
Row B
Row C
Row D
295 exam-style questions on CIE IGCSE Physics Sound, covering Sound. Each one has a worked solution and a mark scheme showing where the marks go.