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9th grade Physics

Through what mediums can mechanical waves travel? solids, liquids and gases.
How are mechanical waves created? a source of energy causes a vibration to travel through a medium
what direction does a transverse wave travel? travels perpendicular- crest and troughs
what direction does a longitudinal wave travel? parallel compressions and rarefractions
What direction does a surface wave travel? both parallel and perpendicular
When a surfer rides an ocean wave on her surfboard, she is actually riding on a what? crest
What is the period of a wave? the time it takes for a wave to complete one cycle?
what are the two formulas for the speed of a wave? wavelength x frequency wavelength/ period
how do you measure the amplitude of a transverse wave? from is rest position to a crest or trough.
how are amplitude and energy related? the more energy a wave has the greater the amplitude.
what is the term that describes when a wave strikes a barrier and bounces back? reflection.
How is reflection different from refraction and diffraction? reflection does not change the wavelength, amplitude or frequency
does the angle light strikes a new medium affect refraction? yes
what causes the most diffraction? if the wavelength is too large compared to the opening or obstacle?
What is the difference between constructive and destructive inference? constructive: creates a larger displacement destructive: creates a wave with a smaller displacement.
how is a standing wave formed? only if half its wavelength or a multiple half fits exactly into the length of a vibrating cord.
what type of wave are sound waves? longitudinal
which medium does sound travel the fastest in? solids.
how does a sonar work? the distance is calculated using the speed of sound in water and the time that the sound waves takes to reach and the objects take to return.
what is resonance and what does it do to sound? resonacnce is the response of two sound waves of the same frenquncey. is use to create dramatic sound.
what is the Doppler effect? as the distance from a sound source increases, the intensity increases.
which part of the ear amplifies sound? the middle ear.
how do electromagnetic waves vary? how they're produced and how they travel.
how do you calculate frequency of an electromagnetic wave? speed/ wavelength. speed = 3.00 x10^8
how does light behave as a wave? has constructive and destructive interference.
how does light behave as a particle? uses photons- packets of electrons.
What color has more photons red or blue blue.
What happens to intensity as you move away from a light source? it decreases.
what is the full range of frequencies of electromagnetic radiation called electromagnetic spectrum.
name the electromagnetic spectrum in order of increasing frequencies. radio waves, microwaves, infrared radiation, visible light, uv ray, x rays gamma rays.
cell phones use what type of wave? radio
how do bones look on xrays white
how does soft tissue look like on x rays dark
how does light interact with transparent material it is transmitted
how does light interact with translucent material it is scattered
how does light interact with opaque? it is absorbed or reflected
what occurs when light wave bends when its goes through another medium? reflected, absorbed or transmitted
what is dispersion of light? the process of white light separating into color.
how can dispersion happen in the atmosphere? raindrops, the drops act like a prism so when the light enters it slows down and refracts.
what determines the color of an object? what is it made of and the color of light that strikes it.
why do blue and yellow combine to produce white light? because the are complementary colors of light?
what are the primary colors of pigments, and what do the produce cyan, magenta, and yellow- produce any other color
what are the primary colors of light green, red and blue- create all possible colors
what happens if a atom gains or looses and electron a net electric charge.
what determines the strength of an electric field? the amount of charge the distance from the charge
what are the three ways a charge can be transferred? contact- Graff sphere, induction placing your hand around a doorknob but no contact- and friction- rubbing your hair on a balloon.
what type of curren is produced by a battery? an electric
what is the difference between a parallel and series circuit? parallel; can still operate if one element stops series: cannot function if one element stops
what is a conductor? a material that makes charge easier to flow.- metal/copper
what is a insulator? a material that does not conduct charge well- rubber and wood
what affects the resistance of an object thickness, temperature and lenght
what would produce the lowest resistance a thick, cool and short wire
a thick, hot, long would produce what lots of resistance.
what is the difference in electrical potential energy between two places in an electric filed is known as? potential difference/ voltage
what is maintained across the terminals of a battery a voltage drop.
what is ohms law v= r x i
what is the unit for electric power watts
what is the unit of electrical energy ? kilowatts
what is the equation of electric power E= current x voltage
what is the current for electrical energy ee= power x time
what are 5 examples of electrical safety? correct wiring, grounding, fuses, circuit breaker and three prong plug.
how does a gfcl work it monitors currents flowing and from an outer appliance
what is a analong signal? produced by a changing voltage and current
what is a digital signal? encodes information as a string of 1's and 0's
what is a vacuum tube used for? strength signals change alternating currents into direct currents turning currents on and off..
what is a semiconductor? a solid that only conducts under certain conditions
what is a cathodes-ray tube it controls the strength and position of the beams to produce images.
Created by: kirsteng393
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