Question

To increase the period of simple pendulum two times, its length must be …….. a) increased two times b) decreased to half c) increased four times d) decreased to one fourth​

Answer 1

Answer:

Option C; increased four times

Explanation:

Since your l is under root so in order to increase Time Period twice you need to increase length by 4 times so that after removal of root you get 2T as answer.

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Answer 2

Answer:

As the time period of simple pendulum is

T = 2π√(l/g)

from here,we can see that T is directly proportional to √l

.So to increase the time period by two times we must increase the length by four times to that of original length.