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![Q 3. (a) Explain what is meant by “bel" and "phon". Discuss the factors influencing Loudness.
(b) Define the intensity and energy density at a point in a plane wave of sound. Obtain an
expression for the intensity of a plane wave in terms of acoustic pressure.
(c) What are the acoustic requirements of a good auditorium? How an auditorium can be used
for speech, music and opera.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F19b6fd05-cb00-4ea0-9657-4a4315c0150c%2F2f2ca4b4-85c8-4137-b8b5-c8dcc84347cd%2Fpajhk29_processed.jpeg&w=3840&q=75)
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