Simple harmonic motion and waves

A pendulum completes 20 vibrations in 10 s. What is its frequency?

• 1 10 Hz
• 2 2 Hz
• 3 200 Hz
• 4 0.5 Hz

The time period T and frequency f are related by:

• 1 T = 2 f
• 2 T = 1 / f
• 3 T = f2
• 4 T = f

A wave has frequency 50 Hz and wavelength 4 m. What is its speed?

• 1 12.5 m/s
• 2 200 m/s
• 3 46 m/s
• 4 54 m/s

Sound waves are:

• 1 Transverse waves
• 2 Not waves
• 3 Electromagnetic waves
• 4 Longitudinal waves

In a transverse wave, the particles of the medium vibrate:

• 1 At right angles to the direction of the wave
• 2 They do not move
• 3 In circles only
• 4 Along the direction of the wave

The period of a simple pendulum depends on its:

• 1 Material
• 2 Mass
• 3 Colour
• 4 Length