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Science- semester 1

8th Grade

What is heat? The energy produced by the movement of molecules
What are three ways heat is transferred? 1. conduction 2. convection 3. radiation
Describe heat transfer through conduction. the transfer of heat within a solid
Describe heat transfer through convection. the transfer of heat within a liquid of gas.
Describe heat transfer through radiation. Heat waves from the sun.
How is heat measured? By the tempurature
What are the three scales for measuring tempurature? 1. farenheit 2. celcius 3. kelvin
What causes sound? vibration
What is the study of sound called? Acoustics
Sound Waves are dependant on.... molecules
What are the parts of a sound wave? crest, trough, baseline, amplitude and wave length
what is a crest? the crest is how high up it goes
What is the trough? the trough is how low it goes
what is Amplitude? the difference between the baseline and the crest or trough
what is the baseline silence
what is the wave length? the length between the waves.
We hear frequency as........ pitch
We hear amplitude as.......... volume
Frequency is measured in.... Hertz
A sensitive human ear can hear which frequencies? highest- 20,000 Hertz lowest- 20 Hertz
volume is measured in..... decibels
what do we hear the crest and trough as? volume
what so we hear the wavelength as? the note, frequency
Light travels through _________ _ and ________ a vacuum and molecules
Most sources of light appear as... white light
visible light can be remembered as....v ROY G. BIV
Objects can _________, __________, or ___________ light reflect, absorb, transm it
Objects can get their color by Reflecting light
In what order does the electromagnetic spectrum go? 1. radio waves 2. micro waves 3 infared 4. visible light 5. ultra violet 6. x-rays 7. Gama rays 8. Cosmic rays
the clear, dome shaped tissue covering the front of the eye Cornea
a patch of dense hair located above the eye eyebrow
one of the many hairs on the edge of the eyelid eyelash
the flap of skin tat can cover and protect the eye eyelid
the colored part of the eye- controls the amout of light that enters the eye iris
a crystalline structure located behind the iris and focuses light on the retina Lens
the nerve that transmits electrical impulses from the retina to the brain Optic Nerve
the opening in the center of the iris, changes size pupil
sensory tissue that lines the back of the eye contains rods and cones that convert light rays into electrical impulses Retina
a thick liquid that fills the center of the eye Vitreous
anvil Tiny bone that passes vibrations from the hammer to the stirrup
cochlea spiral shaped, filled with fluid. lined with cilia (tiny hairs)that move when vibrated
eardrum (also called the tympanic membran) a thin membrane that vibrates when sound waves reach it
Eustachian tube a tube that connects the middle ear to the back of the nose
Hammer also called malleus- a tiny bone that passed vibrations from the eardrum to the anvil
Nerves carry electro chemical signals from the inner ear (the cochlea) to the brain
outer ear canal the tube through which sound travels to the eardrum
pinna (auricle) the visible part of the outer ear.\
Semicircular canals the loops atached to the cochlea
stirrup (stapes) tiny u shaped bone- connected to cochlea, smallest bone in body
outer ear from pinna to eardrum
middle ear includes tiny bones
inner ear cochlea and auditory nerves
sound steps 1. pinna 2. outer ear canal 3. eardrum 4. Hammer 5. Anvil 6. Stirrup 7. semicircular canals 8. cochlea 9. nerves
Created by: AlliesStudyStack