Q. A pendulum clock slows down in summer because the pendulum rod __________.

एक पेंडुलम घड़ी गर्मियों में धीमी हो जाती है क्योंकि पेंडुलम की छड़ __________ होती है।

A
Contracts
अनुबंध
B
Lengthens
लंबा
C
Becomes heavier
भारी हो जाता है
D
Oscillates faster
तेजी से दोलन करता है

Explanation

In summer, the temperature increases, and as a result, the metal rod of the pendulum expands and becomes longer due to thermal expansion. Since the time period TT of a pendulum is given by

T=2πLg,

an increase in length LL causes the pendulum to swing more slowly, leading to a slower clock.

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