Apologia Physical Science 2nd Edition Module 14 Study Guide – Flashcards
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Transverse Wave
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A wave with a direction of propagation that is perpendicular to its direction of oscillation.
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Longitudinal Wave
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A wave with a direction of propagation that is parallel to its direction of oscillation.
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Supersonic Speed
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Any speed that is faster than the speed of sound in the substance of interest.
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Sonic-Boom
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The sound produced as a result of an object traveling at or above Mach 1.
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Pitch
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An indication of how high or low a sound is, which is primarily determined by the frequency of the sound wave.
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In designing a car's horn, the engineers test the sound of the horn and decide that its pitch is too low. To adjust the horn, should the engineers change the electronics so as to produce sound waves with longer or shorter wavelengths?
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Shorter wavelengths.
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A sound wave is traveling through air with a temperature of of 30 degrees C. What is the speed of sound wave?
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*= multiplication V= (331.5+0.6*T) m/sec V=(331.5+0.6*30) m/sec V=(331.5+18) m/sec V= 349.5 m/sec
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If the sound in problem #3 has a wavelength of 0.5 m, what is its frequency?
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Over is fraction bar and the wavelength symbol will WL on the computer because they do not have it on computers. F=V over WL F= 349.5 m/sec over .5 m = 699 Hz
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A sound wave has a speed of 345 m/sec and a wavelength of 500 m. Is this wave infrasonic, sonic, or ultrasonic?
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Infrasonic
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A physicist takes an alarm clock and puts it in an airtight chamber. When the chamber is sealed but still full of air, the physicist is able to hear the alarm despite the fact that he is outside of the chamber. If the physicist then uses a vacuum pump to evacuate essentially all the air out of the chamber, will the physicist still be able to hear the alarm? Why or why not?
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No sound because without air sound cannot travel.
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Are sound waves transverse waves or longitudinal waves.
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Longitudinal waves.
