A wave has wavelength 2 m and frequency 5 Hz. Find its speed.

Solution & explanation

1. Given: λ = 2 m; f = 5 Hz.

2. Find: v in m s⁻¹

3. Write speed = frequency × wavelength.

   $$v=f\times \lambda$$

4. Substitute the frequency and wavelength.

   $$v=5\times 2$$

5. Multiply the two numbers.

   $$v=10$$

6. State the result with units: v = 10 m s⁻¹

v = 10 m s⁻¹