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Unformatted text preview: gallo suarez (meg3556) Topic 4: Waves gill (11111) 1 This print-out should have 41 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 3.0 points 9 . 1 waves crash onto a beach every 50 . 5 s. What is their frequency? Answer in units of Hz 002 3.0 points A harmonic wave travels in a wire with am- plitude 4 . 9 mm, wavelength 2 . 97 m, and fre- quency 541 Hz. What is the speed with which the wave travels? Answer in units of m / s 003 (part 1 of 3) 3.0 points The speed of all electromagnetic waves in empty space is 3 . 00 10 8 m/s. What is the wavelength of radio waves emit- ted at 86 . 5 MHz? Answer in units of m 004 (part 2 of 3) 3.0 points What is the wavelength of visible light emit- ted at 7 . 4 10 8 MHz? Answer in units of m 005 (part 3 of 3) 3.0 points What is the wavelength of X rays emitted at 2 . 9 10 12 MHz? Answer in units of m 006 3.0 points The figure shows two wave pulses that are approaching each other. P Q Which of the following best shows the shape of the resultant pulse when the centers of the pulses, points P and Q , coincide? 1. 2. 3. 4. 5. 007 3.0 points The waves from a radio station can reach a home receiver by two paths. One is a straight- line path from transmitter to home, a distance of 45 km. The second path is by reflection from the ionosphere (a layer of ionized air molecules near the top of the atmosphere). Assume this reflection takes place at a point midway between receiver and transmitter and that there are no phase changes on reflection. If the wavelength broadcast by the radio station is 228 m, find the minimum height h of the ionospheric layer that produces de- structive interference between the direct and reflected beams. Answer in units of km 008 (part 1 of 2) 3.0 points A wave of amplitude 0 . 31 m interferes with a second wave of amplitude 0 . 2 m traveling in the same direction. What is the largest resultant amplitude that can occur? Answer in units of m 009 (part 2 of 2) 3.0 points gallo suarez (meg3556) Topic 4: Waves gill (11111) 2 What is the smallest resultant amplitude that can occur? Answer in units of m 010 3.0 points Explain how you can lower the pitch of a tone on a guitar by altering (a) the length of the string, (b) the tension of the string, or (c) the thickness or the mass of the string. 1. shorter, looser, and more massive 2. longer, looser, and more massive 3. shorter, tighter, and lighter 4. longer, tighter, and more massive 5. longer, looser, and lighter 011 3.0 points A pulse moves on a string at 1 m/s, traveling to the right. At point A , the string is tightly clamped and cannot move. 1 m/s 1 m A Which of the following shows how the string would look soon after 2 seconds?...
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This note was uploaded on 02/04/2012 for the course PHYSICS 101 taught by Professor Nill during the Spring '11 term at Clear Creek.
- Spring '11