Quiz2Solution%20for%20Version%20A

Quiz2Solution%20for%20Version%20A - Physics 1CL 2007 Spring...

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Physics 1CL 2007 Spring Quiz2 Version A . () 330 approaching 0, ( ) 400 433 330 25 330 receding 0, ( ) 400 372 330 ( 25) 372 433 61 Drop 61 o os s s approach s s s receding s s receding approach vv ff v vf f H z H z v f H z H z f f Hz Hz Hz Hz + = ⇒> = = = −− ⇒< = = = =−= Problem 1 12 2 0 0 12 2 10 2 10 0 25 2 7 . 10log( ), 1.0 10 W/m 10 (1.0 10 W/m ) 10 0.01 W/m (0.01 W/m ) (5.0 10 m ) 5.0 10 W I I I II power P I area A PI A β ≡= × == × = × = × Problem 2 . Speed of sound is lowest in gases and highest in solid because the molecules in a solid interact more strongly with each other than do molecules in a gas. Problem 3 12 2 0 92 1 1 12 2 0 21 1 2 00 0 11 . 1.0 10 W/m 0 W /m ) ) 30 1.0 10 W/m 10 ) ) 10[log10 log( )] 10log10 10log( ) ) 10 30 40 10 I I I I I ββ × = × = + =+ = + = −= Problem 4 . Sound waves are Longitudial waves. Problem 5 . Constructive, ,( 0,1,2 ) 1 Destructive, ( ) ,( 0,1,2 ) 2 30.75 30.0 0.75 (1 ) )0.5 22 rrnn rr n n λ = −= + = −== += + Problem 6
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2 22 2 11 2 21 2 2 . 4 4 (10 ) 100 4 /100 av av av P I r
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Quiz2Solution%20for%20Version%20A - Physics 1CL 2007 Spring...

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