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Note: The speed should be in units of cm/s rather than cm.

The relation between the speed (v), frequency (f) and wavelength (λ) is:

v = fλ.

Therefore,

f = v/λ = (500 cm/s) / (20 cm) = 25 Hz.

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Q: What is the frequency of a wave with a wavelength of 20 centimeters and speed of 500 centimeters?
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