A Seconds pendulum executes A. 0.5 beat per second B. 1.0 beat per second C. 2.0 beats per second D. 2.5 beats per second

The frequency of a pendulum is the number of cycles it completes per second. It is given by the formula:

$f = \frac{1}{T}$

For a seconds pendulum, $f = 0.500$ Hz. This means that a seconds pendulum executes 1.0 beat per second.

Option A is incorrect because a seconds pendulum does not execute 0.5 beats per second.

Option C is incorrect because a seconds pendulum does not execute 2.0 beats per second.

Option D is incorrect because a seconds pendulum does not execute 2.5 beats per second.