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The equation of a sound wave is given as: y = 0.0015 sin (62.4 t + 316). The wavelength of this wave is

1. 0.4 unit
2. 0.3 unit
3. 0.2 unit
4. 0.1 unit

Correct answer: 0.2 unit

Solution

The equation of the wave is in the form y = A sin(ωt + kx). Here, k = 316 (wave number), and k = 2π/λ. Solving for λ, we get λ = 2π/k = 2π/316 ≈ 0.2 units.

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