Use the formula: wave speed = frequency × wavelength
Write it as: v = fλ
Measure wave speed in meters per second (m/s)
Measure frequency in hertz (Hz)
Measure wavelength in meters (m)
Multiply the frequency by the wavelength to get the wave speed
If wave period is given, use: wave speed = wavelength ÷ period
Write it as: v = λ / T
Use consistent units before calculating
Rearrange the formula if needed:
frequency = wave speed ÷ wavelength
wavelength = wave speed ÷ frequency