# Wave period and wave speed

The time period of a wave can be calculated using the equation:

This is when:

• the period (T) is measured in seconds (s)
• frequency (f) is measured in hertz (Hz)

### Example

Calculate the time period of a wave with a frequency of 50 Hz.

Question

Calculate the time period of a wave with a frequency of 400 Hz.

## Calculating wave speed

The speed of a wave can be calculated using the equation:

wave speed = frequency × wavelength

This is when:

• wave speed (v) is measured in metres per second (m/s)
• frequency (f) is measured in Hertz (Hz)
• wavelength (λ) is measured in metres (m)

### Example

What is the speed of a wave that has a frequency of 50 Hz and a wavelength of 6 m?

Question

What is the speed of a wave with a frequency of 0.2 Hz and a wavelength of 25 m?