Physics for IGCSE & O level - Waves And Sounds (Section 6 - No. 18)
What is the wavelength of the ultrasound in water, if the frequency is 40 kHz and the speed of sound in water is 1400 m/s?
0.035 m
0.07 m
0.14 m
0.28 m
Explanation
Using the wave equation (speed = frequency * wavelength): wavelength = speed/frequency = 1400 m/s / 40000 Hz = 0.035 m
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