1. Tardigrade
  2. Question
  3. Physics
  4. A locomotive approaching a crossing at a speed o f 80 miles/hr, sounds a whistle of frequency 400 Hz when 1 mile from the crossing. There is no wind, and the spec of sound in air is 0.200 mile/s. What frequency is heard by an observer 0.60 miles from the crossing on the straight road which crosses the railroad at right angles?

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Q. A locomotive approaching a crossing at a speed o f 80 miles/hr, sounds a whistle of frequency 400 Hz when 1 mile from the crossing. There is no wind, and the spec of sound in air is 0.200 mile/s. What frequency is heard by an observer 0.60 miles from the crossing on the straight road which crosses the railroad at right angles?

KCETKCET 2000Oscillations

Solution:

$n^1 = n_0 \left[ \frac{V}{V -V \, cos \, \theta} \right]$