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Hwk9B

# Hwk9B - PHYS 153 Homework 9B Problem 1 A jet plane at...

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PHYS 153 Homework 9B Problem 1 A jet plane at take-off can produce sound of intensity 10 . 0 W / m 2 at 30 . 0 m away. But you prefer the tranquil sound of normal conversation, which is 1 . 0 μ W / m 2 . Assume that the plane behaves like a point source of sound. (a) What is the closest distance you should live from the airport runway to preserve your peace of mind? (b) What intensity from the jet does your friend experience if she lives twice as far from the runway as you do? (c) What power of sound does the jet produce at take-off? Problem 2 a transverse wave on a rope is given by y ( x, t ) = (0 . 750 cm) cos π ( 0 . 400 cm - 1 ) x + ( 250 s - 1 ) t (a) Find the amplitude, period, frequency, wavelength, and speed of propagation. (b) Sketch the shape of the rope at these values of t : 0 , 0 . 0005 s , 0 . 0010 s. (c) Is the wave trav- eling in the + x - or - x -direction? (d) The mass per unit length of the rope is 0
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