HW3 - calculate the intensity, intensity level, pressure...

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

View Full Document Right Arrow Icon
Physics 214 Summer 1993 This week's lab: Experiment #4 (Microwaves) Assignment #3 (due Friday, July 9) 1. The wavefunction of a spherical wave has the form y(r,t) = (A/r) sin (kr - wt + q), where A is a constant and r is the distance from the source. (a) Using this wavefunction, verify that the intensity of a spherical wave decreases with distance as 1/r 2 . ( i.e. Tipler eq. 14-19) (b) Show that y(r,t) satisfies the 3-dimensional wave equation. (Use the identity given in class.) 2. A loudspeaker receives 8.0 W of electrical power from an audio amplifier and converts 3.0% of this power into sound waves. Assuming that the loudspeaker radiates the sound uniformly over a hemisphere (a vertical and horizontal angular spread of 180º),
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: calculate the intensity, intensity level, pressure amplitude, and displacement amplitude at distances of 5.0 m and 10.0 m from the speaker. Also calculate the ratio of the amplitude at 5 m to that at 10 m. 3. 14-74. 4. Calculate the Fourier coefficients of the square wave of Fig. 14-23. For coefficients that are zero, explain (by referring to the shape of the square wave) why they must be zero. Compare your results to Fig. 14-24. 5. The phase velocity of deep-water waves is v ph = (gl/2p) 1/2 . Calculate the group velocity of a deep-water wave pulse with predominant wavelength l. Comment on the relationship between the two velocities. 6. 14-35. 7. 14-62....
View Full Document

This note was uploaded on 11/16/2011 for the course PHYS 214 taught by Professor Thorne during the Summer '08 term at Cornell University (Engineering School).

Page1 / 2

HW3 - calculate the intensity, intensity level, pressure...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online