A guitar player can control the pitch of a string by using the tuning peg to cha

Question

A guitar player can control the pitch of a string by using the tuning peg to change its tension. This works because the__. also changes. length of the string wavelength speed of the waves All of the above When two waves interfere destructively, the_of the resulting wave is smaller. amplitude wavelength frequency speed A pipe that is closed at one end has a fundamental frequency of 100 Hz. Which of the following frequencies is NOT a harmonic of the pipe? 300 Hz 400 Hz 500 Hz all are harmonics of the pipe Two sound waves arc identical, except Hut wave has a smaller amplitude than wave Your ears will perceive wave A to be______than wave A. quieter louder lower in pitch of different quality To decrease the wavelength of a wave, you can eiiher_its frequency_the speed of the wave.. increase; increase decrease:decrease decrease; increase increase;decrease

Explanation / Answer

(a) velocity 'v' on a string is related to tension 'T' by v = (T/)0.5   where is the linear mass density. So the correct option would be C i,e speed of waves.

(b) destructive interference in waves mean decrease in the amplitude of resulting wave hence option A

(c) For a pipe closed at one end its harmonics are given by f = (2n + 1)*f0   where f0 is the fundamental frequency. Threfore for f0 = 100 Hz Option B i,e 400 Hz is not allowed.

(d) Loudness is related to aplitude so wave A will be louder (option B) than wave B.

(e) wavelength '' , speed 'v' and frequency 'f' are related by    = v/f . So the wavelegth can be decreased by either increasing frequency or decreasing speed i,e option D

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