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Sound Intensity from jet engine; first harmonic frequency

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Problem #2
Sound intensity at 3 m from a jet engine is 2 W/m2 .
(a)What is the intensity at 1500 m? (b) Convert your answer for intensity to decibel scale.

Problem #3
Quantitatively explain why the speed of sound in He about thrice the speed of sound in air.

Problem #4
First harmonic frequency of a Harp string is 164.8 Hz. What are its frequencies of second and third harmonics?

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Solution Summary

The expert examines a sound intensity from jet engine for the first harmonic frequency.

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