PHYSICS FINAL EXAM REVIEW
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PHYSICS FINAL EXAM REVIEW
Answer Key!Text me if you have any questions!(Especially 1st 3rd and 6th period )
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1. BFrequency is the number of
waves/vibrations/pulses/oscillations that occur in one second. Frequency is measured in Hertz.
Period is the number of seconds per wave, or 1/f
Amplitude
Wavelength
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2. B, 12. A• Refraction is when the light bends as it
changes the medium it’s traveling through (air to glass, glass to water, water to air, etc)
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3. A, 11. C• Refraction and Diffraction are BOTH about
waves bending, but for different reasons. Diffraction is when they spread out around the edge of a wall, or as they go through a hole in a wall:
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4. D• Remember, in physics, “reflection” doesn’t
mean what you see in the mirror (that’s an image). Reflection is when waves bounce off of an object. An echo happens when sound waves reflect off of a barrier and come back to your ear.
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5. B
Sound waves are the most common example of a longitudinal wave.
Longitudinal waves happen when the particles of the medium move back in forth in the same direction as the wave is moving:
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6. B, 7. C• As it passes you, the apparent frequency
suddenly drops, resulting in a low pitch:
• http://www.physicsclassroom.com/Class/sound/u11l3b.cfm
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8. D
• High frequency = high pitch• Low frequency = low pitch• http://plasticity.szynalski.com/tone-generator.
htm <-- This website lets you pick a frequency and will play the sound so hear the difference between a high frequency and a low frequency (only works in firefox)
• (The LOUDNESS depends on the amplitude.)
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9. A
• Electromagnetic waves do not require a medium to travel through. They are transverse waves.
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10. B
• Transparent = lets all light through (window)• Opaque = lets no light through (wall)• Translucent = lets some light through (frosted
window)• Luminous = gives off light (light bulb)
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13. DSeries Circuits Parallel Circuits
Current is the same in all components Voltage is the same in all components
Voltage is split up between the components: VT = V1 + V2 + …
Current is split up between the components: IT = I1 + I2 + …
Total Resistance: RT = R1 + R2 + … Total Resistance: 1/RT = 1/R1 + 1/R2 + …
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14. A
• Remember the electric field hockey simulation: http://phet.colorado.edu/en/simulation/electric-hockey
• To change the force on the “puck” you can change the charge of the puck OR change the size of the field.
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15. A
• Ohm’s Law says I = V/R• I = Current (measured in amps)
- Current is the amount of charge flowing• V= Voltage (measured in volts)
- Voltage is the energy per charge• R = Resistance (measured in ohms Ω)
- Resistance resists or slows down the flow of charge. • According to the equation, if V increases, then so
does I. If R decreases, I increases.
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16. D
• Ammeters measure amps (units of current)• Voltmeters measure volts (units of voltage)• Ohmmeters measure ohms (units of resistance)
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17. C
• One path only:
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18.ASeries Circuits Parallel Circuits
Current is the same in all components Voltage is the same in all components
Voltage is split up between the components: VT = V1 + V2 + …
Current is split up between the components: IT = I1 + I2 + …
Total Resistance: RT = R1 + R2 + … Total Resistance: 1/RT = 1/R1 + 1/R2 + …
RT = R+R+R+R = 4R
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19. D
• Three paths:
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20. B
• A circuit breaker uses an electromagnet to literally “break the circuit” if there is a dangerous level of current. (This was one of our uses of electromagnets – remember the Brainpop video we watched on electromagnets – or rewatch it. Text me for the password)
• A fuse does the same thing with a melting wire and has to replaced each time, while a circuit breaker can be reset.
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21. B• Moving charges create a magnetic
field – an electromagnet. • We can increase the strength by:• -Increasing the current (usually by
increasing the voltage)• - Wrapping the wire into coils – more
coils = stronger magnetic field• - wrapping the wire around an iron
core (or any other ferromagnetic material – ferromagnetic = attracted to magnets)
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22. TRUE
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23. TRUE
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24. TRUE
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25. FALSE
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26. TRUE
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27. TRUE
• F = ILB
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28. FALSE
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29. TRUE
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30. FALSE
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31. FALSE
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32. TRUE
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33. FALSE
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34. TRUE
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35. FALSE
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36. TRUE
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37. FALSE
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38. B
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39. B
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40. D
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41. D
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42. C
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43. A
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44. A
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45. B
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46. B
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47. C
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48. A
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49. C
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50. D
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51. C
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52. Virtual, Upright, Same Size
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53. Decrease charge or Increase the distance
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53 again (oops!): 3.2 X 10 -8
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54. Conductor, Insulator
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55. -23 microCoulombs