A source of frequency n and an observer are moving on a straight line with velocities a and b respectively. If the source is ahead of the observer and if the medium is also moving in the direction of their motion with velocity c (the velocity of sound being v) then the apparent frequency of sound heard by the observer would be:
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Question

A source of frequency n and an observer are moving on a straight line with velocities a and b respectively. If the source is ahead of the observer and if the medium is also moving in the direction of their motion with velocity c (the velocity of sound being v) then the apparent frequency of sound heard by the observer would be:

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G1 Physics · Accepted Answer

Step 1: Use v = √(B/ρ) in a fluid, v = √(Y/ρ) for longitudinal waves in a solid, or v = √(γRT/M) for an ideal gas. Step 2: Form any required ratio before substituting values. Step 3: Evaluate with the data given. Final: B: [(v − c + b)/(v − c + a)] n.