Painless noise....jaldi bataoo

JEE Main 2015 Papers › Mechanics questions › Painless noise....jaldi bataoo

The loudest painless sound produces a pressure amplitude of 28 Nm^-2.Calculate the intesity of this sound at STP.
density air=1.3 kg m^-3,speed sound=332 m/s

#Physics #Mechanics

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4 Answers

24

eureka123 ·2009-10-23 19:22:52

Q2
a line source emits a cylinderical wave.if the medium absorbs no energy,the amplitude will vary with distance r from source having proptionality as ????

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3

iitimcomin ·2009-10-23 19:39:43

q2 .. 1/root(r)

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eureka123 ·2009-10-23 19:42:45

how ????

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iitimcomin ·2009-10-23 19:52:31

see the waves keep moving outward in concentric circles na ..............

now the energy of the wave closeby and far away is same .............

but the area perp. to its prop. decreases as 1/r .................

thus intensity decreases as 1/r and hence A dec as 1/root(r)

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