The speed (or sometimes you might see it called velocity) of a wave, v, is how far the wave travels in a certain time. Wave speed is measured in metres per second (m/s). All the electromagnetic waves travel at 300,000,000 metres per second (3 x 10

^{8}m/s). Sound travels at about**340 metres per second**.In this manner, what is the unit for speed of a wave?

Speed = Wavelength x Wave Frequency. In this equation, wavelength is measured in meters and frequency is measured in

**hertz**(**Hz**), or number of waves per**second**. Therefore, wave speed is given in meters per**second**, which is the SI unit for speed.How do you measure the speed of the wave?

Apply this to

**waves**: count the number of**waves**passing each second (= frequency), and multiply by the length of each (= wavelength) to find the**speed**.**speed**= distance/time = l/T= l / (1/f) = f λ. Work through three examples: A simple example, perhaps for sound in air, with values in Hz and m.What happens when you change the speed of a wave?

The

**speed**of a**wave**is only altered by alterations in the properties of the medium through which it travels. The wavelength of a**wave**does not affect the**speed**at which the**wave**travels. Both**Wave**C and**Wave**D travel at the same**speed**.