A spring 4m long resonates in Four segments (nodes at both ends). The frequency of the system is 20 Hz, then speed of the wave in the spring is _:
Correct answer: A. 40 m/sec
- A. 40 m/sec
- B. 40 cm/sec
- C. 80 m/sec
- D. 100 m/sec
Explanation
The correct answer is 40 m/sec. The speed of a wave in a medium is given by the formula: speed = frequency x wavelength. In this case, the frequency is 20 Hz and the spring resonates in four segments with a total length of 4m, resulting in a wavelength of 4m. Therefore, the speed = 20 Hz x 4m = 40 m/sec. Options B, C, and D are incorrect as they do not correctly calculate the speed based on the given data.
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