A string 0.80 m long is fixed at both ends, and transverse waves travel along it at 240 m/s. What is the frequency of its fundamental mode?
Correct answer A. 150 Hz
Explanation
In the fundamental mode the string length is half a wavelength, so λ = 2L = 1.6 m and f = v/2L = 240/1.6 = 150 Hz. Using λ = L gives 300 Hz.
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