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PART ONEComplete the Electricity and Magnetism Exercises.APA style is not required, but solid academic writing is expected.PART TWOComplete the Wave, Sound, and Light Exercises.APA style is not required, but solid academic writing is expected.
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PHY-102: Electricity and Magnetism Exercises
Complete the following exercises.
1. Why are good conductors of heat also good conductors of electricity?
2. What is the difference between a good conductor and a good insulator?
3. Which of the following are conductors? (Select all that apply)
A. Wood
B. Copper
C. Gold
D. Plastic
E. Distilled water
4. Which of the following are insulators? (Select all that apply)
A. Wood
B. Copper
C. Gold
D. Plastic
E. Distilled water
5. A nail contains trillions of electrons. Given that electrons repel from each other, why do
they not then fly out of the nail?
6. How do the number of electrons flowing into a light bulb compare to the number of
electrons flowing out of it?
7. A light bulb connected to a 9-V battery has a current of 1.5 A flowing.
a. Find the resistance of the light bulb (in ohms)
b. Find the power drawn by the light bulb (in W)
8. Consider three identical light bulbs connected as shown in the circuit below.
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a. Which light bulb(s) will be brightest? Explain.
b. What will happen to B and C if light bulb A is removed? Explain.
c. What will happen to A and B if light bulb C is removed? Explain.
9. Rank the following from smallest current to largest current.
A. A 1200W microwave connected to 110V outlet.
B. A 1500W water heater connected to 220V outlet.
C. A 100W light bulb connected to 110V outlet.
D. A 2000W oven connected to a 220V outlet.
E. A 40W Light bulb connected to a 12V battery.
10. Your friend says an appliance uses energy. How would you correct his statement?
11. Describe the differences and similarities between an electromotor and a generator.
12. Your friend with great excitement tells you about his newest idea to solve the energy
crisis: He wants to use an electromotor to drive a generator and then use part of the
electric power generated to power the electromotor while using the rest to power his
home. What would you tell him?
13. Why is a paper clip attracted to a magnet, while is pencil is not?
14. A loop of wire embedded in the road at an intersection can be used to trigger a traffic
signal. This is an application of magnetic induction. Explain.
The remaining questions are multiple-choice questions:
15. Two like charges:
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A. Attract each other
B. Repel each other
C. Must be neutrons
D. Neutralize each other
16. When a plastic rod is rubbed with fur, the rod will become negatively charged. Which of
the following best explains how this happens?
A. Electrons are transferred from the plastic rod to the fur.
B. Electrons are transferred from the fur to the plastic rod.
C. Negative charges are created on the plastic rod.
D. Positive charges are removed from the plastic rod.
17. What is characteristic of a good insulator?
A. Electrons are usually not moving at all.
B. Electrons are free to move around.
C. Electrons are semi-free to move around.
D. Electrons are tightly bound to the nuclei.
18. In a solid conductor such as a metal, what is the cause of an electric current?
A. A flow of positive and negative charges.
B. A flow of positive charges only.
C. A flow of negative charges only.
D. A flow of protons.
E. A flow of neutrons.
19. How does the resistance of a 100W light bulb compare to the resistance of a 60W light
bulb?
A. The 100W light bulb has a higher resistance than the 60W light bulb.
B. The 100W light bulb has a lower resistance than the 60W light bulb.
C. The 100W light bulb has the same resistance as the 60W light bulb.
D. Not enough information to tell.
20. Consider the five circuits in the diagram below.
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In which of the circuits will the light bulb light up?
21. What causes an electric field?
A. A moving change only.
B. A stationary charge only.
C. Any charge, moving or stationary.
D. A stationary magnet.
22. What causes a magnetic field?
A. A moving change only.
B. A stationary charge only.
C. Any charge, moving or stationary.
23. What does a step-up transformer do?
A. It steps up the energy.
B. It steps up the power.
C. It steps up the voltage.
D. It steps up the current.
24. Which of the following is true for a generator?
A. It transforms thermal energy to electrical energy.
B. It transforms mechanical energy into electrical energy.
C. It transforms electrical energy into mechanical energy.
D. It transforms solar energy into electrical energy.
25. Which of the following is true for an electromotor?
A. It transforms thermal energy to electrical energy.
B. It transforms mechanical energy into electrical energy.
C. It transforms electrical energy into mechanical energy.
D. It transforms electrical energy into potential energy.
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PHY-102: Wave, Sound, and Light Exercises
Complete the following exercises.
1. What is the source of all waves?
2. A water wave vibrates up and down four times each second, the distance between two
successive crests is 5 meters, and the height from the lowest part to the highest part of the
wave is 2 meters.
a. What is the frequency of the wave in hertz?
b. What is the period of the wave in seconds?
c. What is the speed of the wave in meters per seconds?
d. What is the amplitude of the wave in meters?
3. When you sit in the stands at a baseball stadium, you will hear the crack of the bat a short
time after you see the batter hit the ball. Explain.
4. Why is the moon sometimes described as silent?
5. You are hiking in a canyon and you notice an echo. You decide to let put a yell and
notice it took 2 seconds before you heard the echo of your yell. How far away is the
canyon wall that reflected your yell?
6. Explain how the Doppler effect is used by the police to measure the speed of a car.
7. The light from the sun has higher frequencies from one side of the sun than from the
other side. What does that tell you about the sun?
8. What is the source of all electromagnetic waves?
9. Why is the lettering on the front of an ambulance “backwards” (see figure below)?
10. What do radio waves, microwaves, light, and x-rays have in common?
11. Rank the following electromagnetic waves in order of increasing frequency.
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A. Microwaves
B. Radio waves
C. Ultraviolet radiation
D. Visible light
E. X-rays
F. Infrared radiation
12. During a lunar eclipse the moon is in the shadow of the Earth. Why does the moon have
a faint red color during the eclipse?
13. The distance from the sun to the Earth is 1.5 x 1011 m. How long does it take for light
from the sun to reach the earth? Give your answer in seconds.
14. Why are polarized sunglasses particularly effective in reducing glare?
15. Match the following colored objects with the way in which the colors are produced.
1) Red rose
2) Rainbow
3) Oil film
4) Peacock feather
5) Blue sky
A. Scattering
B. Refraction
C. Diffraction
D. Interference
E. Selective reflection
The remaining questions are multiple-choice questions:
16. If the frequency of a vibration is doubled, what happens to the period?
A. The period is doubled.
B. The period remains the same.
C. The period is reduced to one-quarter.
D. The period is reduced to one-half
E. The period is quadrupled.
17. What is the distance between two successive crests on a transverse wave called?
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A. Wavelength
B. Period
C. Amplitude
D. Frequency
E. Compression
18. Noise-cancelling earphones use which of the following phenomena?
A. Frequency
B. Constructive interference
C. Destructive interference
D. Resonance
E. Beats
19. If the sun were to suddenly “turn off’, we would not know about it for about 8 minutes.
Why?
A. It would take about 8 minutes to realize what happened because of the darkness.
B. It takes about 8 minutes for the sun to “power down”.
C. It takes about 8 minutes for Earth to spin around so we can see the sun.
D. It takes about 8 minutes for the light to travel from the sun to Earth.
20. If the atmosphere was much thicker than it is now, how would the sun appear?
A. The sun would appear the same.
B. The sun would appear blue-violet.
C. The sun would appear green-blue.
D. The sun would appear red-orange.
E. The sun would appear yellow-green.
21. If you dip your finger in a tub of water at a constant rate, concentric circular waves with a
constant spacing (wavelength) will form. If you double the frequency at which you dip
your finger, what will happen to the wavelength?
A. The wavelength is reduced to one-quarter.
B. The wavelength is reduced to one-half.
C. The wavelength is quadrupled.
D. The wavelength is doubled.
E. The wavelength remains the same.
22. If you hear the clap of a thunder 5 seconds after seeing the flash of lightning, how far
away from you did the lightning strike?
A. About 5 miles
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B. About 5 kilometers
C. About 1 mile
D. About 1 kilometer
23. What are the three paint colors used for color subtraction?
A. Red, yellow, and blue
B. Red, green, and blue
C. Orange, purple, and green
D. Magenta, green, and yellow
E. Magenta, cyan, and yellow
24. If you shine a beam of red light and a beam of green light on the same area of a screen,
what color will you see on the screen?
A. Red
B. Green
C. White
D. Yellow
E. Cyan
F. Magenta
25. If you mix equal amounts of cyan pigments and magenta pigments on a sheet of white
paper, what color will you see on the paper?
A. Red
B. Blue
C. Black
D. Yellow
E. Cyan
F. Magenta
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