Easy
A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. Using v = f × λ, the speed of the wave is ______.
Explanation
Explanation
Step 1: Write the formula: wave speed v = frequency f × wavelength λ.
Step 2: Substitute f = 500 Hz and λ = 0.68 m.
Step 3: v = 500 × 0.68 = 340 m/s.
Step 4: This equals the speed of sound in air at about 20 °C, so the answer is reasonable.
Answer: 340 m/s.
PRO TIP
Re-check your working by substituting the answer back into the original question.