A student investigates sound waves in a solid.
The student hangs a metal rod of length 1.0 m from two threads. The student taps one end of the rod with a hammer and records the sound with a frequency app on a phone.
The app shows that the frequency of the sound is 2500 Hz.
For this rod, the wavelength of the sound in the rod is twice the length of the rod.
Calculate the wavelength of the sound in the rod.
Calculate the speed of sound in the rod.
Explain why a stopwatch would not be suitable for measuring the time taken for the sound to travel along the rod.
The student taps the rod harder.
State what happens to the amplitude and to the frequency of the sound.
112 exam-style questions on Edexcel GCSE Physics 4.1 Wave properties, covering 4.1.1 Waves transfer energy and information, 4.1.2 Frequency, wavelength, amplitude, period and wavefronts, 4.1.3 Longitudinal and transverse waves, 4.1.4 The wave speed equations, 4.1.5 Measuring wave velocity, and 4.1.6 Calculating depth or distance from waves. Each one has a worked solution and a mark scheme showing where the marks go.