Microquiz_11

Microquiz_11 - ConcepTest 16.2a Speed of Sound I (1) water...

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(1) water (2) ice (3) same speed in both (4) sound can only travel in a gas Do sound waves travel faster in water or in ice? ConcepTest ConcepTest 16.2a 16.2a Speed of Sound I

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(1) water (2) ice (3) same speed in both (4) sound can only travel in a gas Do sound waves travel faster in water or in ice? ConcepTest ConcepTest 16.2a 16.2a Speed of Sound I Speed of sound depends on the inertia inertia of the medium and the restoring force restoring force . Since ice and water both consist of water molecules, the inertia is the same for both. However, However, the force holding the molecules together is greater in ice the force holding the molecules together is greater in ice (because it is a solid), so the restoring force is greater. (because it is a solid), so the restoring force is greater. Since v = = (force / inertia), (force / inertia), the speed of sound must be greater in ice greater in ice !
You drop a rock into a well, and you hear the splash 1.5 s later. If the depth of the well were doubled, how long after you drop the rock would you hear the splash in this case? 1) more than 3 s later 2) 3 s later 3) between 1.5 s and 3 s later 4) 1.5 s later 5) less than 1.5 s later ConcepTest ConcepTest 16.3 16.3 Wishing Well

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You drop a rock into a well, and you hear the splash 1.5 s later. If the depth of the well were doubled, how long after you drop the rock would you hear the splash in this case? 1) more than 3 s later 2) 3 s later 3) between 1.5 s and 3 s later 4) 1.5 s later 5) less than 1.5 s later Since the speed of sound is so much faster than the speed of the falling rock, we can essentially ignore the travel time of the sound. As for the falling rock, it is accelerating as it falls, so it covers the bottom half of the deeper well much quicker than the top half. The total time will not be exactly 3 s, but somewhat less. ConcepTest ConcepTest 16.3 16.3 Wishing Well Follow-up: Follow-up: How long does the sound take to travel the depth of the well? How long does the sound take to travel the depth of the well?
away from a speaker and you hear a certain intensity of sound. If you double your distance from the speaker,

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This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.

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Microquiz_11 - ConcepTest 16.2a Speed of Sound I (1) water...

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