The number of ocscillations performed by the bob at the end of 10 s is______

Options

A. ` 4^(1//2)`
B. 5
C. 6
D. `12^(1//2)`

Answer

B

Explanation

As the time period of the oscillation, (T) = 2s
` T= 2pisqrt(l/g)`
`T^(2) = 4pi^(2)l/g`
` l = (gT^(2))/(4pi^(2)) = (10xx4)/(4 xx 10) = 1 m`