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A chord attached about an end to a vibrating fork divides it into 6 loops when its tension is 36 N. The tension at which it will vibrate 4 loops is:A. `24N`B. `36N`C. `64N`D. `81N` |
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Answer» Correct Answer - D For waves along a string `:` `u prop sqrt(T)` `rArr lambda prop sqrt(T)` Now, for 6 loops `: 3 lambda _(1)=L` `rArr lambda_(1)=L//3` `&` for 4 loops `: 2 lambda_(2)=L` `rArr lambda_(2)=L//2` `rArr (lambda_(1))/(lambda_(2))=(2)/(3)` `rArr T_(2)=(9)/(4)xxT_(1)=(9)/(4)xx36` `=81N. Ans.` |
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