Question

Pendulum clocks become slow in summer because

(a) days in summer are large.

(b) of the friction in the coil.

(c) the length of the pendulum increases.

(d) the weight of the pendulum changes.

Answer 1

(c) the length of the pendulum increases.

Pendulum clocks become slow in summer

because the length of the pendulum increases.

Increase in length ∆l = lo a ∆T

Where lo = original length, α = coefficient of

linear expansion and ∆T = change in temperature.