An acoustic transmitter is submerged in a freshwater lake. It produces sound waves in the water with a wavelength of 0.32 m0.32\text{ m}0.32 m.
The frequency of the sound waves is 4.5 kHz4.5\text{ kHz}4.5 kHz. Calculate the speed of the sound waves in the water.
State a typical value for the speed of sound in air.
State and explain, for the sound produced by this transmitter, how the wavelength of the sound in air compares with the wavelength of the sound in water.
Sound is a longitudinal wave. Explain what is meant by a longitudinal wave.
The sound waves from the transmitter emerge through a narrow opening (gap) in a submerged barrier. The sound diffracts as it passes through this gap.
State how the width of the gap affects the extent of the diffraction.
State how the wavelength of the sound affects the extent of the diffraction.
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.