When are beats generated in two interfering waves? when they have slightly different velocities when they have the same wavelength when they have slightly different frequencies when they have the same amplitude when they have slightly different amplitudes

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.