A light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating at a frequency of 56 Hz and allowed to free fall. Calculate how many complete oscillation are couhnted when plate falls st 10 cm
A light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating at a frequency of 56 Hz and allowed to free fall. Calculate how many complete oscillation are couhnted when plate falls st 10 cm
A
10
B
9
C
8
D
7
Text Solution
Verified by Experts
The correct Answer is:
C
Let n = frequency
and N= number of oscillations
Time taken to full freely to a distance 10 cm
`" s=1/2g.t^(2)rArrt=sqrt((2xx10)/(g))`
The frequency of oscillation during this time
`n=N/t rArrN=nt rArrN=56xxsqrt((2xx10)/(980))`
`N=7.999=8`
and N= number of oscillations
Time taken to full freely to a distance 10 cm
`" s=1/2g.t^(2)rArrt=sqrt((2xx10)/(g))`
The frequency of oscillation during this time
`n=N/t rArrN=nt rArrN=56xxsqrt((2xx10)/(980))`
`N=7.999=8`
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