The time required to produce one cycle of a wave is known as the wave's 1.
amplitude
2.
frequency
3.
period
4.
wavelength

a and c

c is 100% but i am confused in a

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.