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The two parts of a sonometer wire divide...

The two parts of a sonometer wire divided by a movable knife edge , differ in length by `2 mm` and produce `1 beat//s` , when sounded together . Find their frequencies if the whole length of wire is `1.00 m`.

A

`250.5` and `249.5`

B

`230.5` and `229.5`

C

`220.5` and `219.5`

D

`210.5` and `209.5`

Text Solution

Verified by Experts

The correct Answer is:
A
`l_(1)+l_(2)=100cm` `l_(2)-l_(1)=0.2cm`
`l_(2)=50.1cm`, `l_(1)=49.9cm` `n_(1)-n_(2)=1`
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