1.

The tension in a piano wire is 10 N. What should be the tension in the wire to produces a note of double the frequency ?

Answer»

5 N
20 N
40 N
80 N

SOLUTION :We know that in a stretched string
`v = (1)/(2L) sqrt((T)/(m)) rArr "" v prop sqrt(T)`
`THEREFORE (v_(2))/(v_(1)) = sqrt((T_(2))/(T_(1)))`
`rArr " " (2v)/(V)= sqrt((T_(2))/(10))rArrT_(2) = 40 N `
Correct choice is (c).


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