Homework 01

# Homework 01 - HOMEWORK 1 SOLUTIONS PROBLEM 20.16 Refer to...

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HOMEWORK 1 SOLUTIONS PROBLEM 20.16 : Refer to the figure in order to answer the following questions: (a) What is the amplitude of this wave? The amplitude is the maximum displacement of a wave. Based on the figure above, the maximum value that D has is 6.0 cm . (b) What is the frequency of this wave? From the diagram, we can calculate the period, or the time it takes to complete 1 oscillation. If you look at how long it takes to go from trough to trough, we see that T = 0.6s Hz 67 . 1 s 6 . 0 1 T 1 f f 1 T = = = = (c) What is the wavelength of this wave? The wave speed is given and we have just calculated the frequency, therefore: m 2 . 1 Hz 67 . 1 0 . 2 f v f v s m = = = λ λ = PROBLEM 20.34 : The sound intensity from a jack hammer breaking concrete is 2.0 W/m 2 at a distance of 2.0 m from the point of impact. This is sufficiently loud to cause permanent hearing damage if the operator doesn't wear ear protection. What is the sound intensity for a person watching from 50 m away? The sound intensity from a jack hammer breaking concrete is at a distance of 2.0 m from the point of impact. This is sufficiently loud to cause permanent hearing damage if the operator doesn't wear ear protection.

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## This note was uploaded on 04/10/2008 for the course PY 2404 taught by Professor Cardenas during the Spring '08 term at Saint Mary's University Texas.

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Homework 01 - HOMEWORK 1 SOLUTIONS PROBLEM 20.16 Refer to...

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