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The string AB vibrates in two loops with...

The string `AB` vibrates in two loops with a tuning fork when block hasngs in air. Now block is completely immersed in water, the string vibrates in three loops with same tuning fork. The specific gravity of block is :

A

`1.2`

B

`1.8`

C

`2`

D

`5//9`

Text Solution

Verified by Experts

The correct Answer is:
B
The string `AB` ………..
`(T_(1))/(T_(2)) = ((3)^(2))/((2)^(2)) = (9)/(4), implies 4T_(1) = 9T_(2)`
specific gravity of block
`= (wt.in air)/("loss in wt. in water") = (T_(1))/(T_(1)-T_(2))`
`= (1)/(1-(T_(2))/(T_(1))) = (1)/(1-(4)/(9)) = (9)/(5) = 1.8`
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