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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About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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