Light and Sound

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  • Created by: Eesha Dev
  • Created on: 25-06-15 16:56
How does sound travel to our ears?
Object vibrates, air vibrates, eardrum vibrates, ossicles vibrate, hairs in cochlea vibrate, message sent to the brain
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Describe what frequency is and how it looks on a chart
Pitch of Sound, Shown by length of waves (spaces), far=low, close=high, measured in Hertz (Hz)
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Describe what amplitude is and how it looks on a chart
Volume of sound It is shown by the height of the sound waves-big=loud small=quiet Measured in Decibels (dB)
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What does the pinna do?
Collects and funnels sound into ear
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What do the semi-circular canals do?
Contains wax to trap dust and dirt
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What does the eardrum do?
Vibrates when sound strikes
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What are ossicles?
Small bones which amplify vibrations
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What does the auditory canal do?
Sends out signals when liquid moves tiny hairs
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What does the cochlea do?
Changes sound into signals
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What do the auditory nerves do?
Carries signals to brain
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How do we see things?
When light reflects off of something and into our eyes
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Why do we see things first but hear things later?
Light travels faster than sound
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What is a light ray?
Straight path taken by light
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What is a light beam made up of?
Several light rays
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What is a parallel beam
Transfer of energy in the same direction
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What is a diverging beam?
Transfer of energy in different directions
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What is a converging beam?
Light energy focused on one point (focal point)
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How are shadows formed?
When an opaque object blocks out the light
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How are umbrae and penumbrae formed?
Umbrae are formed when there are light rays coming from one point but penumbrae are formed when the light rays come from more than one point
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What is a normal?
A line that is perpendicular to a surface where light strikes
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What is refraction?
When light bends as it travels through glass
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What is a medium?
Substances that light travel through
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When does light bend towards the normal?
When light goes from a less dense medium to a more dense medium
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When does bend away from the normal?
When light travels from a more dense medium to a less dense medium
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Why is the image on a pinhole camera inversed?
Because the light rays cross over to flip the object and create a flipped over image
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Name a law of reflection
Angle of Incidence=Angle of Reflection
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What are the primary colours of light?
Blue, red and green
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What are the secondary colours of light?
Cyan, magenta, yellow
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What is the scalera
Tough and protective layer
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What does the choroid do?
Supplies eye with blood
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What does the retina do?
Converts image into electrical signals
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What does the optic nerve do?
Takes signals to brain
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Where is the cornea and what does it do?
Front of eye, allows light in
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What does the iris do?
Controls how much light enters
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What does the pupil do?
Allows light in
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What does the lens do?
Changes shape to focus image onto retina
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Other cards in this set

Card 2

Front

Describe what frequency is and how it looks on a chart

Back

Pitch of Sound, Shown by length of waves (spaces), far=low, close=high, measured in Hertz (Hz)

Card 3

Front

Describe what amplitude is and how it looks on a chart

Back

Preview of the front of card 3

Card 4

Front

What does the pinna do?

Back

Preview of the front of card 4

Card 5

Front

What do the semi-circular canals do?

Back

Preview of the front of card 5
View more cards

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Eesha Dev

Please note that all of the resources that I make are actually for myself. Of course, please do feel free to use any of my resources if you wish but I kindly request that you do not show hate as these resources are mine and I have spent my time making them to help me with my tests. I am aware of my spelling mistakes but like I said, I made these resources for myself. However, you all may use them if you would like to but if not, please leave. There is no need for hate.

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