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2010 PHYSICS 002C Lecture 04

# 2010 PHYSICS 002C Lecture 04 - PHYSICS 002C Lecture 04...

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PHYSICS 002C Lecture 04 April 05, 2010 Serway and Jewett Chapter 13.1-4 Mechanical Waves Clicker Q1: At time t = 0 a wave pulse moving in the + x direction with wave velocity v has amplitude . What is the amplitude at any time t ? 1 2 ) 1 ( x y a) 1 ) ( 2 vt x y ; b) ; c) 1 2 1 ) ( vt x y 1 2 ) ( vt x y ; d) ; e) . 1 2 1 ) ( vt x y 1 2 2 2 ) ( t v x y Clicker Q2: What is the wavelength of a 10 Hz wave with wave speed 10 m/s and amplitude 0.1 m? a) 0.1 m; b) 100 m; c) 1 m; d) 10 m; e) 0.01 m. Clicker Q3: What is the tension in a rope of negligible mass suspending a 1 kg mass? a) 1 kg; b) 10 m/s 2 ; c) 10 N; d) 1 kg/m 2 ; e) 10 m/s. Chap 13.1 Propagation of a pulse or wave E-mail allows us to send information to other people without any physical object exchanging hands as in snail mail. What? This is accomplished by sending bits of energy in the form of light waves in optical fibers over great distances to transmit encoded messages. Examples of mechanical waves – Sound in air, sound traveling through the bones in your head, seismic waves, water waves, ultrasound in your body to look at heart valves. What about the sound of the Starship Enterprise? No material, no mechanical wave. DEMO : Warning the fireman with my fiber signaling device.

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2010 PHYSICS 002C Lecture 04 - PHYSICS 002C Lecture 04...

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