Physics for IGCSE & O level - Waves And Sounds (Section 7 - No. 16)
What will happen to the frequency of a wave if the wavelength doubles (assuming the speed remains constant)?
The frequency will double.
The frequency will halve.
The frequency will stay the same.
The frequency will become zero.
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If the wavelength doubles and speed is constant, the frequency must halve (Speed = Frequency x Wavelength).