9th grade Physics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Through what mediums can mechanical waves travel? | solids, liquids and gases.
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| How are mechanical waves created? | a source of energy causes a vibration to travel through a medium
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| what direction does a transverse wave travel? | travels perpendicular- crest and troughs
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| what direction does a longitudinal wave travel? | parallel compressions and rarefractions
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| What direction does a surface wave travel? | both parallel and perpendicular
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| When a surfer rides an ocean wave on her surfboard, she is actually riding on a what? | crest
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| What is the period of a wave? | the time it takes for a wave to complete one cycle?
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| what are the two formulas for the speed of a wave? | wavelength x frequency
wavelength/ period
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| how do you measure the amplitude of a transverse wave? | from is rest position to a crest or trough.
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| how are amplitude and energy related? | the more energy a wave has the greater the amplitude.
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| what is the term that describes when a wave strikes a barrier and bounces back? | reflection.
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| How is reflection different from refraction and diffraction? | reflection does not change the wavelength, amplitude or frequency
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| does the angle light strikes a new medium affect refraction? | yes
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| what causes the most diffraction? | if the wavelength is too large compared to the opening or obstacle?
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| What is the difference between constructive and destructive inference? | constructive: creates a larger displacement
destructive: creates a wave with a smaller displacement.
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| how is a standing wave formed? | only if half its wavelength or a multiple half fits exactly into the length of a vibrating cord.
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| what type of wave are sound waves? | longitudinal
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| which medium does sound travel the fastest in? | solids.
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| 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.
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| 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.
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| what is the Doppler effect? | as the distance from a sound source increases, the intensity increases.
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| which part of the ear amplifies sound? | the middle ear.
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| how do electromagnetic waves vary? | how they're produced and how they travel.
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| how do you calculate frequency of an electromagnetic wave? | speed/ wavelength. speed = 3.00 x10^8
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| how does light behave as a wave? | has constructive and destructive interference.
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| how does light behave as a particle? | uses photons- packets of electrons.
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| What color has more photons red or blue | blue.
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| What happens to intensity as you move away from a light source? | it decreases.
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| what is the full range of frequencies of electromagnetic radiation called | electromagnetic spectrum.
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| name the electromagnetic spectrum in order of increasing frequencies. | radio waves, microwaves, infrared radiation, visible light, uv ray, x rays gamma rays.
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| cell phones use what type of wave? | radio
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| how do bones look on xrays | white
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| how does soft tissue look like on x rays | dark
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| how does light interact with transparent material | it is transmitted
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| how does light interact with translucent material | it is scattered
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| how does light interact with opaque? | it is absorbed or reflected
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| what occurs when light wave bends when its goes through another medium? | reflected, absorbed or transmitted
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| what is dispersion of light? | the process of white light separating into color.
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| how can dispersion happen in the atmosphere? | raindrops, the drops act like a prism so when the light enters it slows down and refracts.
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| what determines the color of an object? | what is it made of and the color of light that strikes it.
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| why do blue and yellow combine to produce white light? | because the are complementary colors of light?
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| what are the primary colors of pigments, and what do the produce | cyan, magenta, and yellow- produce any other color
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| what are the primary colors of light | green, red and blue- create all possible colors
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| what happens if a atom gains or looses and electron | a net electric charge.
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| what determines the strength of an electric field? | the amount of charge
the distance from the charge
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| 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.
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| what type of curren is produced by a battery? | an electric
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| 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
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| what is a conductor? | a material that makes charge easier to flow.- metal/copper
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| what is a insulator? | a material that does not conduct charge well- rubber and wood
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| what affects the resistance of an object | thickness, temperature and lenght
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| what would produce the lowest resistance | a thick, cool and short wire
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| a thick, hot, long would produce what | lots of resistance.
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| what is the difference in electrical potential energy between two places in an electric filed is known as? | potential difference/ voltage
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| what is maintained across the terminals of a battery | a voltage drop.
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| what is ohms law | v= r x i
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| what is the unit for electric power | watts
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| what is the unit of electrical energy ? | kilowatts
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| what is the equation of electric power | E= current x voltage
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| what is the current for electrical energy | ee= power x time
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| what are 5 examples of electrical safety? | correct wiring, grounding, fuses, circuit breaker and three prong plug.
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| how does a gfcl work | it monitors currents flowing and from an outer appliance
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| what is a analong signal? | produced by a changing voltage and current
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| what is a digital signal? | encodes information as a string of 1's and 0's
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| what is a vacuum tube used for? | strength signals
change alternating currents into direct currents
turning currents on and off..
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| what is a semiconductor? | a solid that only conducts under certain conditions
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| what is a cathodes-ray tube | it controls the strength and position of the beams to produce images.
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vahajuddin
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