Question: what is the unit of wave speed?
Answer: The speed (or sometimes you might see it called velocity) of a wave ( ) is how far the wave travels in a certain time. Wave speed is measured in metres per second ( m s − 1 ). All the electromagnetic waves travel at 300,000,000 metres per second ( 3 × 10 8 m s − 1 ). Sound travels at about 340 metres per second.