Two simple pendulums whose lengths are 100 cm and 121 cm are susp… - Vidyadip

MCQ

Two simple pendulums whose lengths are $100 \ cm$ and $121 \ cm$ are suspended side by side. Their bobs are pulled together and then released. After how many minimum oscillations of the longer pendulum, will the two be in phase again

A
$11$
✓
$10$
C
$21$
D
$20$

✓

Answer

Correct option: B.

$10$

Let $T_1$ and $T_2$ are the time period of the two pendulums $T_1=2 \pi \sqrt{\frac{100}{g}} \text { and } T_2=2 \pi \sqrt{\frac{121}{g}}\ (T_1)= 10$

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