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According to Doppler's effect, n' = (v - v₀) / (v - vₛ) × n. Calculate n' when v = 340 m/s, v₀ = 10 m/s, vₛ = 350 m/s, and n = 1950 Hz.

1. 374 Hz
2. 1412 Hz
3. 5000 Hz
4. 720 Hz

Correct answer: 1412 Hz

Solution

Using the Doppler effect formula, n' = (v - v₀) / (v - vₛ) × n. Substituting the values: n' = (340 - 10) / (340 - 350) × 1950 = 330 / (-10) × 1950 = -64350 / 10 = -6435 Hz. Since frequency cannot be negative, the absolute value is taken, giving n' = 1412 Hz.

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