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32 Cards in this Set

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lens

light is focused onto the retina

cornea

focuses light and protects the eye

Iris

controls the amount of light entering the eye

ciliary muscle

where light enters the eye

retina

where light is focused and detected

optic nerve

carry information to the brain

lateral inversion?

right is left etc in a mirror

REFRACTION

The path of the ray is bent inside the glass because it is denser than air but when the light comes back it onto the air it goes back to the original shape.


The speed of light changes depending on the density of the material it is travelling through.

Prism splitting light- DISPERSION

A prism splits a ray of white light into the colours of the rainbow.


This is called DISPERSION

White light?

THE SPECTRUM

light refracts the slowest:

red light

light refracts the fastest:

violet light

red+blue

magenta

blue+green

cyan

red+green

yellow

red+blue+green

white light

RAINBOW...

water droplets in the air the sun illuminates them from behind, you may see a rainbow.


light enters the water droplets and refracts. it then reflects off the back of the rain drop.


Red light refracts the least and violet the most. This causes dispersion of the sunlight. When the spectrum made by the first prism passes through a second prism, the colours are recombined to make light again.

pitch=

frequency

volume=

amplitude

what do you see this on… os..

oscilloscope

Sound travels fastest through..

solids

why does sound travel fastest through a solid?

particles are closer together, this means they can vibrate more easily and are more easily passed from particle to particle.

older people cannot hear a ______ frequency

higher

what is temporary hearing loss?

hearing loss that may be caused by ear infections and colds after which hearing recovers.

what is permanent hearing loss?

hearing loss and deafness can be present at birth or occur if the ear is damaged or diseased.

hearing range of the average person:

20hz - 20,000hz

if a solid is heated its temperature rises until it reaches the ________

melting point

at the melting point the temperature stops _____


while the solids melt because the energy goes into ___________ the ________.

rising, separating, particles

once all the solid has _____ the temperature _______ again until it reaches the ______ _______.

melted, rises, boiling point

at the _____ _______ the temperature again stays the ______ as the energy ________ the particles again.

boiling point, same, separating

the ________ of a substance depends on how far apart the particles are.

density

air is least dense and rises tot he top, water is denser so sinks to the bottom.


this is important in explaining __________

convection