Question

Q-. Length of a second pendulum is:
1 m
100 cm
Both (1) and (2)
100 m​

Answer 1

Answer:

T1=2s; l1=100cm; [HERE l = DENOTES LENGTH ]

T2=1.4s; L2 =?

T2T1=L2L1

=1.42 = l=100

Squaring both sides, we get:

1.96× 4 =L2 100

⇒l 2 = 4×100×1.96

=49.0 cm