Discussion
Statement I: Raising bypass ratio was the most effective measure ever taken against aircraft noise.
Statement II: Jet noise power varies roughly with the eighth power of jet velocity.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the magnitude of the first. Because acoustic power varies as \( V_j^8 \), cutting the jet velocity from 800 to 400 m/s divides the noise power by \( 2^8 = 256 \), some 24 decibels. No other single measure has come close, and it is why the transition from turbojet to high bypass turbofan transformed airport noise while simultaneously improving fuel consumption.
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