A stationary wave is set up on a string that is fixed at both ends. The frequency of the wave is 400 Hz. If the speed of the wave is 480 m/s, then what is the length of the string?
Correct answer: C. 0.60m
- A. 1.2m
- B. 0.84m
- C. 0.60m
- D. 0.42m
Explanation
Option A is correct since by Applying the formula: F = v / 2L 2L = v / F , 2L = 480 / 400 = 1.2 / 2 = 0.60 m Options B, C, and D are incorrect since the given options are wrong answers.
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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