Homework 13

# Homework 13 - Bautista Aldo – Homework 13 – Due Dec 2...

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Unformatted text preview: Bautista, Aldo – Homework 13 – Due: Dec 2 2005, 4:00 am – Inst: Maxim Tsoi 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Sound in air can best be described as which of the following type of wave? 1. Longitudinal correct 2. Polarized 3. Transverse 4. Electromagnetic 5. Torsional Explanation: A sound wave in the air is propagated by the oscillation of air molecules. It is best described as longitudinal wave. 002 (part 1 of 1) 10 points Middle C has a speed of 1500 m/s in water and 340 m/s in air. Does it have a longer or shorter wavelength in water than in air and why? 1. Shorter wavelength in water because wa- ter is denser than air 2. Longerwavelengthinwaterbecausewater is denser than air 3. Shorter wavelength in water because the speed of sound is greater in water than in air 4. Longer wavelength in water because the speed of sound is greater in water than in air correct Explanation: wavelength = velocity frequency The velocity of sound in water is larger than in air. The frequency doesn’t change, so the wavelength in water is larger than in air. 003 (part 1 of 1) 10 points An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m / s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 6 s? Correct answer: 4590 m. Explanation: Let : v = 1530 m / s t = 6 s 2 = 3 s d = v t = (1530 m / s)(3 s) = 4590 m . 004 (part 1 of 1) 10 points What two physics mistakes occur in a science fiction movie that shows a distant explosion in outer space, where you see and hear the explosion at the same time? 1. First, the explosion cannot occur in outer space; second, if it could, the faster-moving light would reach you before the sound. 2. First, the explosion cannot occur in outer space; second, if it could, the sound would reach you before the light. 3. First, in outer space there is no air to carry sound; second, if there were, the faster-moving light would reach you before the sound. correct 4. First, in outer space there is no material to carry light; second, if there were, the sound would reach you before the light. 5. None of these Explanation: First, in outer space there is no air or other material to carry sound, o you cannot hear the sound. Second, if there were, faster-moving light would reach you before the sound. Bautista, Aldo – Homework 13 – Due: Dec 2 2005, 4:00 am – Inst: Maxim Tsoi 2 005 (part 1 of 2) 10 points The range of human hearing extends from approximately 20 Hz to 20000 Hz....
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Homework 13 - Bautista Aldo – Homework 13 – Due Dec 2...

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