Infrasonic sound waves have a frequency :

1. between 20 Hz to 10,000 Hz
2. below 20 Hz
3. above 20,000 Hz
4. between 20 Hz to 20,000 Hz

The diagram shown below depicts a displacement time graph of particle a wave travelling with speed 20 m/s.

The frequency of the wave is :

1. 50 Hz
2. 33.3 Hz
3. 100 Hz
4. 1000 Hz

What are mechanical waves?

Define amplitude in relation to a wave