A speaker emits sound of frequency $880, Hz$ . The speed of sound in air is $343, m/s$ . What is the wavelength of the sound produced?

easy 1 mark Class 9 · Science · Sound

Answer

0.39, m

The correct answer is $0.39, m$ — 3. Compute $λ \approx 0.389, m$ , which rounds to $0.39, m$ .

Step-by-step solution

1. Use the relation between speed, frequency and wavelength: $v = f, l amb d a$ .
2. Solve for wavelength: $λ = \frac{v}{f} = \frac{343}{880}, m$ .
3. Compute $λ \approx 0.389, m$ , which rounds to $0.39, m$ .

Common mistake: Using

l amb d a = f / v

instead of

l amb d a = v / f

Concept tested: Wavelength of sound