A wave has wavelength 0.5 m and frequency 200 Hz. Calculate speed.

Solution & explanation

1. Given: λ = 0.5 m; f = 200 Hz.

2. Find: v in m s⁻¹

3. Write speed = frequency × wavelength.

   $$v=f\times \lambda$$

4. Substitute the frequency and wavelength.

   $$v=200\times 0.5$$

5. Multiply the two numbers.

   $$v=100.0$$

6. State the result with units: v = 100 m s⁻¹

v = 100 m s⁻¹