Question

There is fluctuation in time measured by a pendulum clock, why

Answer 1

Answer:

A major source of error in pendulum clocks is thermal expansion; the pendulum rod changes in length slightly with changes in temperature, causing changes in the rate of the clock. An increase in temperature causes the rod to expand, making the pendulum longer, so its period increases and the clock loses time.

Explanation:

Mark it as a brainliest