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Two simple pendulum of lengths 1 m and 9 m respectively are both given a displacement in the same direction at the same instant. They will again be in phase after the shorter pendulum has completed number of oscillations areA. `1//4`B. `3//2`C. `4//3`D. `2` |
Answer» Correct Answer - B `n_(1)prop(1)/(sqrt(l_(1)))andn_(2)prop(1)/(sqrt(l_(2)))` `n_(1)sqrt(l_(1))=n_(2)sqrt(l_(2))` `(3)/(n_(1))=(1)/(n_(2))` `n_(1)=3n_(2)andn_(2)=(n_(1))/(3)` `n_(1)-n_(2)=1` `n_(1)-(n_(1))/(3)=1` `3n_(1)-n_(1)=3` `n_(1)=(3)/(2)` |
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