Q8. A thin metal plate is placed against the teeth ofcog wheel. Cog wheel is rotated at a speed of| 120 rotations per minute and has 160 teeth Calculate1) Frequency of node produced 2) Speed of sound, if wavelength is 1.05 metre 3)What will be the effect when speed of cog wheel is doubled
Answers
Frequency of node produced and speed of sound is 320 Hz and 336 m/s respectively.
Explanation:
=> It is given that,
Cog wheel is rotated at a speed = 120 rotations/minute and
No of teeth, n = 160
=> Frequency of the rotation, f :
= 120 Rotations / 60 sec
= 2 Hz
1) Frequency of node produced, f':
f' = n*f
= 160 * 2
= 320 hz
2) Speed of sound, if wavelength is 1.05 metre, v:
v = λ * f
= 1.05 * 320
= 336 m/s
3) When speed of cog wheel is doubled:
In this case, frequency of nod increases and as a result sound becomes shrill.
Learn more :
Q:1 If the velocity of sound in air is 340m/s calculate the (a) wavelength when frequency is 256 hertz (b) frequency and wavelength is 0.85 M
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Q:2 A tuning fork makes 256 vibrations per second in air ,if the speed of sound is 330m/s ,what is the wave length of the sound?
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Answer:
a) 320 Hz
b) 336 m/s
c) Sound will become shrill