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InterviewSolution
| 1. |
If the frequency of a wave is increased by 25 %, then the change in its wavelength will be:(medium not changed)(A) 20% increase17.(B)20% decrease(C) 25% increase(D) 25% decrease |
| Answer» <p>wavelength = v/f </p><p>now when f is increased by 1.25f </p><p>=> now, wavelength = v/1.25f = 100v/125f = 4v/5f</p><p>so, new wavelength = 4/5*(old wavelength) => % decrement = (1-4/5)*100% = 100/5 = 20% </p> | |