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Physics
9th grade Physics
| Question | Answer |
|---|---|
| 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:
vahajuddin
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