Wavelength and frequency

1 mark · Easy

Describe what happens to the wavelength of a water wave when its frequency is doubled, with speed kept constant.

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The wavelength halves when the frequency is doubled if speed stays constant.

Also accept: Wavelength will be halved.

Common mistakes: Thinking wavelength is doubled

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Marking points

B1 · 1 mark · States that wavelength is halved if frequency doubles and speed is constant.

Worked solution

If frequency is doubled and wave speed is constant, wavelength becomes half as large.