Flashcards
Sound
Cards in this deck (21)
- 1How is sound produced?Sound is produced When something vibrates, moving back and forth very quickly. The vibrations are then passed into its surroundings (eg. air) creating regions of space in which the air particles are bunched together and regions which they are more spread out.
- 2What are compressions?Bunched up areas.
- 3What are rarefractions?Spread-out areas.
- 4What is a sound wave?The movement of alternating compressions and rarefractions.
- 5How do soundwaves travel?Away from the source of sound, in the same way that ripples of water move outwards when a stone is dropped into a pond.
- 6What is the vibrating source of -speech -drum -piano -saxophone -car stereo system -a bell ringing-folds of skin (vocal chords)
-drum skin
-string inside piano
-reed inside the mouthpiece and air inside the saxophone
-speaker cone
-metal casing of the bell when struck - 7What does sound rely on?Sound relies on vibrating particles, therefore it can pass through solids, liquids and gases but not through a vacuum where there are no particles.
- 8What does a wave carry?Energy from one point to another.
- 9What is a transverse wave?A wave in which the vibration is at right angles to the direction the wave is travelling.
Eg. Radiated Heat Energy - 10What is the difference between a sound wave and a transverse wave?In a sound wave the particles that make up the wave move back and forth in the same direction as the wave is travelling.
- 11What is a longitudinal wave?A wave in which the vibration is in thew same direction as the wave is travelling.
- 12What is an echo?Reflection of sound waves.
- 13What is reverberation?The length of time a sound can be heard.
- 14What is frequency?The number of vibrations a sound makes each second.
- 15What is hertz (Hz)?Frequency is measured in hertz.
- 16What is a wavelength?The distance from one peak of a wave to the next.
- 17What is wavelength measured in?Metres.
- 18What is an oscilloscope (CRO) ?The oscilloscope is a graph-displaying instrument.
- 19Why does it echo in an unfurnished room?In an unfurnished room sound reflects from the hard surface and cause echoes.
- 20What happens to our ears as we age?As we age, more of the tiny hair cells in our inner ear become damages or destroyed. This happens most eassily to the hair cells that we use to hear high frequency sounds and once they are destroyed these cells can't be repaired.
- 21What is the speed of sound in air at 18˚C?342m/sec
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- Flashcards on Sound, created by Hafsa Ali on 28/07/2019.
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- Hafsa Ali
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