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f09final

# Probe 2 each measure 020 a what

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Unformatted text preview: object should be placed a. just inside the focal point of the lens (i.e., the object distance should be a little less than the focal length) b. just outside the focal point of the lens (i.e., the object distance should be a little more than the focal length) c. As close to the lens as possible. Name__________________________________ 12. (2 pts) In the diagram at right, along which direction should you look in order to see the sun? (circle the correct direction). 13. (2 pts) 14 C decays to 14 N . The particle given off in this decay is a 6 7 air a b c water a. gamma photon b. electron c. positron € € d. alpha particle 14. (2 pts) Radon has a half ­life of 3 d. How long until only 25% of a sample of radon remains? a. 3 d b. 4.5 d c. 6 d d. 9 d e. 12 d 15. In the figure at right, the arrows represent the electric field created by source charges (not shown). The three labeled dots simply represent points in space. Rank the electric potentials at 1 those three points, from greatest to least. (3 pts) 2 3 16. Source charges (not shown) create a P Q pattern of electric potential described by the diagram below. The two labeled dots just represent points in space. +120 V +100 V +80 V a. On the diagram, draw vectors representing +40 V +60 V the electric field at each of those two points in space, carefully showing the correct direction and relative magnitudes of the electric fields at the two points. (2 pts) b. Would you have to do positive work, negative work, or no work to move a positive charge from P to Q? Explain your reasoning. (3 pts) Name__________________________________ 17. The diagram below shows a conducting loop held in place near a current ­carrying solenoid. The current through the solenoid is decreasing. a. Is there a current in the loop? If so, determine its direction, and indicate it on the diagram. If not, explain why not. (4 pts) b. Does the solenoid exert a force on the loop? If so, does it attract or repel the loop? If not, explain why not. (3 pts) 18. Which creates the wider interference pattern when passing through double slits, a beam of 100 keV electrons or a beam of 400 keV electrons? Explain. (3 pts) Name__________________________________ 19. From the representation at right, determine the wave’s a. period (2 pts) b. frequency (2 pts) c. amplitude (2 pts) 20. It’s been determined that the critical angle associated with a particular liquid ­air interface is 30°. a. Is total internal r...
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