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31 Cards in this Set
- Front
- Back
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1. What is electromagnetic radiation?
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It is the energy carried by a wave that can travel through empty space and matter.
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2. How do electromagnetic waves form?
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They form when an electric charge vibrates.
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3. What are some properties of electromagnetic waves?
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Wavelength, frequency and speed.
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4. What is the speed of electromagnetic waves in space?
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300,000 km/s
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5. What are the three most common waves emitted by the sun?
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Infrared, ultraviolet, and visible light
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6. What is the electromagnetic spectrum and how do the waves differ?
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It is the entire range of electromagnetic waves with different frequencies and wavelength
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7. List a common everyday use for the 7 types of EM waves.
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radio waves - radio, microwaves - cell phones, infrared - tv remote control, light - stop sign, ultraviolet - sunburn, x-ray look at bones, gamma rays-PET
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8. What is light?
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It is electromagnetic radiation that you can see.
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9. What are some sources of light?
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The sun, a campfire, a lightbulb, a firefly.
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10. How does light travel?
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Light travels as a wave moving away from a sources. It also behaves like a particle
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11. What can happen to light that strikes matter?
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Light can be transmitted, absorbed or reflected.
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12. Why do objects appear to have different colors?
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The color of an object is the color of light that reflects off the object.
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13. Which particles found in atoms have the property of electric charge?
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Protons and electrons
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14. How do electrically charged objects interact?
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Objects with like charges repel one another, while objects with unlike charges attract.
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15. How do electric insulators and electric conductors differ?
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Electric insulators do not move electrons easily whereas, electric conductors do.
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16. What are three ways by which objects can become electrically charged?
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Objects can become electrically charged through contact, induction, or conduction.
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17. What is an electric discharge?
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It's the process by which an unbalanced electric charge becomes balanced.
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19. What is an electric current?
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The movement of electrically charged particles.
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20. What is an electric circuit
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A closed, or complete path in which an electric current travels
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21. What is voltage?
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The amount of energy the source uses to move one coulomb of electrons through the circuit.
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22. What is electrical resistance?
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It's a measure of how difficult it is for an electric current to flow in a material.
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23. Describe Ohm's Law.
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Ohm's Law is a mathematical equation that describe's the relationships among voltage, current and resistance.
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24. What are the three basic parts of an electric circuit?
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Power supply, conductors, and electrical device.
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25. What is the difference between a series circuit and a parallel circuit?
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In a series circuit there is only one pathway in which the current may travel. In parallel circuit, there are multiple pathways.
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26. What types of forces do magnets apply to other magnets?
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The poles attract if they have opposite charges and repel if they have like charges.
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27. What two effects are representative of Earth having a magnetic field?
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1. Compasses
2. Auroras |
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28. Why is nickel a magnetic material?
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It is magnetic because it is attracted to a magnet.
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29. Why are some materials magnetic?
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Some materials are magnetic because their atoms are all pointing in the same direction.
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30. Why are some magnets temporary while other are permanent?
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Some magnets are temporary because their atoms are not lined up in the same direction.
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31. Why does a magnet apply a force to an electric current?
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The electric current is moving electrons and the magnet has a magnetic field that interacts with it in the direction of the current or field.
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32. How are magnets used in electric motors?
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Two magnets are mounted outside of a coil of wire that is attached to a power source.
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