A referee blows a whistle. The sound from the whistle has a frequency of 2.5 kHz2.5\ \text{kHz}2.5 kHz.
The speed of sound in air is 340 m/s.
Show that the wavelength of the sound is about 0.14 m.
Calculate the period of the sound wave.
Use the equation
period=1frequency\text{period} = \dfrac{1}{\text{frequency}}period=frequency1
A spectator hears the whistle 0.60 s after it is blown.
Calculate the distance between the spectator and the referee.
The referee uses a different whistle with a frequency of 5.0 kHz5.0\ \text{kHz}5.0 kHz.
Explain what happens to the wavelength 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.