For the given wave speed, the frequency is 2.0 Hz
The frequency is the number of cycles per second in the sinusoidal wave.
Given is the length of the string L = 40cm, the wave speed v =320 cm/s, then the wavelength is
λ =4L
λ =4 x 40 cm =160 cm.
The frequency is related to the wavelength as
f =v/λ
f =320/160
f=2.0 Hz
Thus, the frequency is 2.0 Hz.
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