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8th Grade

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