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Figure shown a clamped metal string of l...

Figure shown a clamped metal string of length `30 cm` and linear mass density `0.1 kg //m`. Which is taut at a tension of `40N`. A small rider `(` piece of paper `)` is placed on string at point `P` as shown. An external vibrating tuning fork is brought near this string and oscillations of rider are carefully observed.

At which of the following frequencies of turning fork, rider will not vibrate at all `:`

A

`(100)/(3)Hz`

B

`50Hz`

C

`200Hz`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
Wave velocity in string is
`v=sqrt((T)/(mu))=sqrt((40)/(0.1))=20m//s`
Fundamental frequency of string oscillations is
`n_(0)=(100)/(3)Hz,(200)/(3)Hz, 100Hz, (400)/(3)Hz, ......`
Here rider will not oscillate at all only if it is at a node of stationary wave in all other cases of resonance and non`-` resonance it will vibrate at the frequency of tuning fork. At a distance `(l)/(3)` from one end node will appear at `3^(rd),6^(th),9^(th)` or similar higher Harmonics `i.e.` at frequencies `100Hz, 200Hz,......`
If string is divided in off no. of segments, these segments can never resonate simultaneously hence at the locaton of rider, antinode is never obtained at any frequency.
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