1.

A simple pendulum of length 121 cm takes 11/3 minutes to execute 100 oscillations. Then the time that another simple pendulum of length 81 cm takes to execute the same number of oscillations isA. 2 minutesB. 3 minutesC. 6 minutesD. 9 minutes

Answer» Correct Answer - B
`t_(1)=nT_(1)andt_(2)=nT_(2)`
`(t_(2))/(t_(1))=(T_(2))/(T_(1))=sqrt((l_(2))/(l_(1)))=sqrt((81)/(21))`
`(t_(2))/(t_(1))=(9)/(11)`
`therefore t_(2)=(9)/(11)xx(11)/(3)=3` minutes.


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