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QUIZ 16 Nota means none of the above. |
| 1. An ampere is a unit of |
| a. current |
| b. pressure |
| c. charge |
| d. nota |
| 2.What is the effect of on the current in a wire if the voltage across it is doubled ? |
| a. The current is doubled |
| b. The current is reduced by one half |
| c. the current does not change. |
| d nota |
| 3.What is the effect of on the current in a wire if both the voltage across it and the resistance are doubled? |
| a. the current is doubled |
| b. the current is reduced by one half |
| c. the current remains the same |
| d.nota |
| 4. True or False. A coulomb of charge that passes through a 6-volt battery is given 6 joules of potential energy |
| a. True |
| b. False |
| 5.A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor? |
| a. 2 Volts |
| b. 50 Volts |
| c. 1/2 Volt |
| 6. What kind of field surrounds a charge that is at rest? |
| a. electric |
| b. magnetic |
| c. electric and magnetic |
| d. nota |
| 7.What kind of field surrounds a moving charge? |
| a. electric |
| b. magnetic |
| c. electric and magnetic |
| d. nota |
| 8. True or False. The source of all magnetism is moving electric charge |
| a. True |
| b. False |
| 9. If a magnetic field exerts a a force on a |
| a. moving charge |
| b. a charge at rest |
| 10. If a a steady magnetic field exerts a force on a moving charge, the force is directed |
| a. opposite the motion |
| b. in the direction of the motion |
| c. at right angles to the direction of motion |
| d. nota |
| 11. If a charge moves parallel to a magnetic field, the force on the charge is |
| a. maximum |
| b. zero |
| 12. True or False. The geographic north pole of the Earth is a magnetic south pole |
| a. True |
| b. False |
| 13. The magnetic north pole of a compass is attracted to the |
| a. geographic north pole of the Earth |
| b. geographic south pole of the Earth |
| c. nota |
| 14. A length of wire is bent into a closed loop and a magnet near the loop is at rest. The current in the loop is |
| a. zero |
| b. not zero |
| 15. A length of wire is bent into a closed loop and a magnet nearby is thrust (moved) into the loop. The current in the loop will be |
| a. zero |
| b. not zero |
| 16. Electromagnetic induction occurs in a loop of wire when there is a change in |
| a. the electric field intensity through in the loop. |
| b. the magnetic field intensity through the loop. |
| 17. Most of the waves in the electromagnetic spectrum are visible to the naked eye |
| a. visible to the naked eye. |
| b. invisible to the naked eye. |
| 18. The main difference between a radio wave and a light wave it its |
| a. speed |
| b. wavelength |
| 19. Which has the largest frequency, a radio wave or a light wave? |
| a. radio wave |
| b. light wave |
| 20. Which of these waves has the shortest wavelength? |
| a. light waves |
| b. radio waves |
| c. x-rays |
| 21. Which requires a physical medium in which to travel. |
| a. ultraviolet waves |
| b. sound waves |
| 22. Compared to ultraviolet waves, the wavelength of infrared waves is |
| a. shorter |
| b. longer |
| c. the same |
| 23. Compared to an ultraviolet wave, speed of an infrared waves is |
| a. more |
| b. less |
| c. the same |
| Extra Credit Chapter 31 |
| 24. The frequency of violet light is about twice that of red light. How does the energy E of a violet photon compare with energy of a red photon? |
| a. energy is twice the energy of a red photon |
| b. energy is one half the energy of a red photon |
| c. same energy |
| 25. The ratio of the energy of a photon to its frequency is |
| a. pi |
| b. Planck's constant h |
| c. nota |
| 26. Which of the following photons the the greatest energy? |
| a. an ultraviolet photon |
| b. an infrared photons |
| c. both photons have the same energy |
| 27. Does the DeBroglie wavelength of en electron longer or shorter as the momentum increases ? |
| a. longer |
| b. shorter |
| c. remains the same |
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Extra Credit Chapter 32 28. True or false. According to the Bohr model of the hydrogen atom, an orbiting electron forms a standing wave only when the circumference of its orbit is equal to a whole number multiple of its wavelength. a. True b. False
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