Quiz10b

# Quiz10b - n is an integer a n 1 2 b n 1 c n 1 2 d n 1 2 2 3...

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Physics 53 Quiz #10b Fall 2007 Name ___________________________ Recit. Section _______ Circle the correct answer [2 points for each part]: 1. Consider a one-dimensional wave of the form D ( x,t ) = 5 cos(2 x - 3 t ), where D and x are given in meters, t in seconds. What is the speed of propagation of the wave? a) 1.50 m/s. b) 0.667 m/s. c) 0.333 m/s. d) 3 π /2 m/s. 2. Consider the one-dimensional wave D ( x , t ) = cos 2 x + t ( ) ! cos 2 x ! t + " ( ) , where D and x are given in meters, t in seconds. Where are the nodes of this standing wave located (
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Unformatted text preview: n is an integer)? a) n + 1 2 ( ) ! . b) ( n + 1) . c) ( n + 1) 2 . d) n + 1 2 ( ) 2 3. Consider a wave on a string moving to the right as shown in the figure. What is the direction of the velocity of a particle at the point labeled A? a) To the right. b) To the right and up. c) Straight up. d) The particle is at rest. 4. The intensity of a sound wave emitted isotropically in all directions from a point-like source falls off with distance r like: a) 1/ r . b) 1/ r 2 . c) 1/ r 3 . A...
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