waves and superposition hwk - 4th Problem Set Phy132 Due...

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4th Problem Set Phy132 Due Friday, February 10 Problem 1 . The net amplitude at a point in space is equal to the sum of the following two amplitudes: d 1 ( t ) = 4 sin ( ωt ) (1) and d 2 ( t ) = 4 cos ( ωt ) (2) Determine the resultant amplitude, d ( t ) = d 1 ( t ) + d 2 ( t ). Hint: write the cosine function as a sine function with a phase and add the two sine functions. Problem 2 . Two small speakers emit sound waves of different frequencies, that is, they are in- coherent sources. Speaker A has an output of 10 milli-watts, and speaker B has an output of 20 milli-watts. You are located a distance of 5 meters away from speaker B, and 4 meters away from speaker A. What sound intensity level (in dB) do you hear if a)only speaker A is on b)only speaker B is on c)both speakers are on Problem 3 . Luis is standing on the sidewalk when a police car drives by with its siren on. As the car approaches, Luis notices that the frequency of the siren is 560 Hz. As the car drives away, he notices that the frequency of the siren is 480 Hz. How fast was the police car going?
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  • Spring '07
  • Rainey

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