This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: oldhomewk 33 PAPAGEORGE, MATT Due: Apr 28 2008, 4:00 am 1 Question 1, chap 16, sect 1. part 1 of 1 10 points When a particular wire is vibrating with a frequency of 3 . 8 Hz, a transverse wave of wavelength 76 . 5 cm is produced. Determine the speed of wave pulses along the wire. Correct answer: 2 . 907 m / s (tolerance 1 %). Explanation: If the frequency is f and the wavelength is then the speed of wave is v = f = (3 . 8 Hz) (76 . 5 cm) (0 . 01 m / cm) = 2 . 907 m / s Question 2, chap 16, sect 2. part 1 of 1 10 points Radio waves travel at the speed of light: 300000 km / s. What is the wavelength of radio waves re ceived at 104 . 5 MHz on your FM radio dial? Correct answer: 2 . 87081 m (tolerance 1 %). Explanation: Let : v = 300000 km / s = 300 million m / s and f = 104 . 5 MHz = 104 . 5 million Hz . = v f = 300 million m / s 104 . 5 million Hz = 2 . 87081 m . Question 3, chap 16, sect 2. part 1 of 1 10 points Two harmonic waves are described by y 1 = A sin( k x t 1 ) and y 2 = A sin( k x t 2 ) , where k = 7 m 1 , A = 3 m , = 115 rad / s , 1 = 0 rad , and 2 = 3 rad . What is the frequency of the resultant wave y = y 1 + y 2 ? Correct answer: 18 . 3028 Hz (tolerance 1 %). Explanation: From the basic trigonometric relation sin 1 + sin 2 = sin 1 + 2 2 cos 1 2 2 , where 1 = k x t 1 and 2 = k x t 2 ....
View
Full
Document
This note was uploaded on 03/02/2009 for the course PHY 58235 taught by Professor Kleinman during the Spring '09 term at University of Texas at Austin.
 Spring '09
 KLEINMAN
 Physics

Click to edit the document details