waves and superposition hwk

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

• Notes
• 3

This preview shows pages 1–2. Sign up to view the full content.

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?

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.
• Spring '07
• Rainey

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern