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17 Cards in this Set
- Front
- Back
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Are sound waves longitudinal or transverse?
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Longitudinal
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What are sound waves?
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Alternating areas of high and low pressure
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What is an echo?
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A reflection of a sound off a hard, flat surface
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How are sound waves passed?
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Through vibrating molecules
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What is the frequency range for human hearing?
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20 - 20 000 Hz
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What sort of frequency gives a higher pitch?
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Higher
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The larger the amplitude, the ... the sound
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Louder
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Equation for speed
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Speed = Distance
---------------- Time |
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When measuring speed of sound, how do you know the guns been shot?
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The smoke
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What effect does reaction time have on your readings?
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They can fluctuate and make your readings too high.
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What is the speed of sound?
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3x10(8) m/s
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How do you find the speed on a distance/time graph?
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Gradient.
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On an oscilloscope, how do you find the time taken for one complete wave?
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Crest to crest
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The closer the crests on an oscilloscope, the ... the pitch
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Higher
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The larger the amplitude, the ... the sound
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Louder
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On an oscilloscope, what does one division represent?
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An amount of time, eg 1ms
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In the picture, what do the two dashed lines show compared to the thick line?
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Short- Louder
Long- Lower pitch and quieter |
