Flashcards
physics-sound
Cards in this deck (9)
- 1what is sound caused byvibrations
- 2what can sound travel throughsolids, liquids and gases
- 3what is the speed of sound in air340 m/s
- 4what are sound levels measured indecibels (dB)
- 5what is the threshold of hearingit is the lowest sound that can be heard (0dB)
- 6what sound level can damage the human hearing90 dB
- 7what is ultrasounda sound with a range above human hearing (20 000 Hz)
- 8what is sound reproductionwhen sound waves are converted into electrical signals by a microphone, made stronger with an amplifier and turned back into sound by a loud speaker
- 9what is noise cancellationwhen unwanted sound is cancelled out by adding the opposite sound to interfere destructively
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- Flashcards on physics-sound, created by Jeni Woolley on 10/03/2015.
- Created by
- Jeni Woolley
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