A locomotive whistle 256 Hz is moying towards a stationary observerwith a velocity `(1)/(20)^(th)` that ufsound. What will bethe frequencies of the notes heard by observer beforeand after the engine passes it ?

Explanation

To solve the problem of determining the frequencies of the notes heard by an observer before and after a locomotive whistle passes by, we can use the Doppler effect formula. Here’s a step-by-step solution:

### Given:
- Frequency of the locomotive whistle, \( f = 256 \, \text{Hz} \)
- Velocity of sound, \( v \) (we will keep it as \( v \) for now)
- Velocity of the source (locomotive), \( v_s = \frac{1}{20} v \)
- Velocity of the observer, \( v_o = 0 \) (stationary observer)

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