Flashcards
Sem título
Flashcards do conjunto (13)
- 1what starts sound?sound starts when particles vibrate in materials e.g banging a drum
- 2what makes sound loud and quiet?loud sounds are made from large vibration whereas quiet sounds are made from smaller vibrations
- 3how do sound waves move?sound waves move from compressions (pushed together) and rarefaction (moving away). sound waves are sequences of both compressions and rarefractions
- 4what is amplitude? What is frequency?amplitude is how loud or quiet something is.
pitch is how high or low the sound is. - 5how is frequency measured?the frequency of a sound is the number of vibrations per second. (hertz (hz))
- 6what is noise?noise is any unwanted sounds
- 7parts of the ear?pinna (outer ear)
ear drum
ossicles
oval window
cochlea
auditory nerve - 8what is sound intensity measured in?decibels
- 9what is the law of reflection?the angle of reflection is equal to the angle of incidence
- 10what is refraction?when light waves enter a different material (e.g glass), the speed changes causing the light to bend
- 11what happens to refraction in a more dense material?when light enters a more dense material the light goes towards the normal
- 12do all the colours of the rainbow have the same wave length?no. all the colours have slightly different lengths. Red has the longest, violet has the shortest
- 13how do we see colour?we see colour because all the other colours except that colour are being absorbed by the object. (e.g all colours except blue are absorbed in a blue door and the blue light is reflected into our eyes.
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- FlashCards sobre Sem título, criado por billinghammia em 25-04-2015.
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