Compton Effect - General Physics - Past Exam, Exams of Physics

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PHYSICS 219 FOS FINAL EXAM RED TEST December 17, 2003 Fill in your name and 1.0. number in both filled circles and letters in the ina above the circlas whera indicated on the scantron sheet. Use only a #2 pencil. Sign the scantron sheet where indicated. Mark tha correct answers on your copy of this test and fill in the answers in the circles on the scantron sheet. Hand in the scantron sheet and keep your test fo check answers against the key to ba posted on CHIP. BE SURE TO HAND IN YOUR SCANTRON SHEET IN THE CORRECT COLOR PILE. Pick the answer clisgest to yours ag some roundoff occurs. There are 20 questions do them all. This is a two hour exam. 1. Photons of what minimum frequency are required to remove electrons from gold? Note: The work function for gold Is 4.8 a. —A 6.47 > 1018 Hz B. 4.64 > 1014 Hz —&. 3,84 > 10°? Hz DB. 1.146 > 10'S Hz BE. 7.24 >» 1014 Hz 2. In the Compton atfect, a photon of wavelength 4 and frequency ¢ hits an elactron that is initially at rast. Which one of the following occura as a result of ihe collision? _. A. The photon loses anergy, so the final photon has a wavelength lesa than 6. The photon gains energy, so the final photon has a wavelength graater than 6. » The photen gains energy, so the final photon has a frequency greater than f. __ 0. The photon is absarbed completely. __—. The photon loses energy, a¢ the final photon has a fraquency less than i. 3. Determine tha de Broglia wavelength of a neutron (m= 1.67 > 10-27 kg) which has a speed of 5.0 mvs, _A 395 nm —_ 8. 529 1m _& 1975 nm —_D. 162 nm E 7nm 4. Each atom Jn the pariadic tabla has unique set of spectral lines. Which one of the following statements is tha best explanation for this observation? — 4. Each atom has @ dense central nucleus, _.. B. The electrons in atoms are In constant motion. —C. Each atom has 4 unique set of anergy levels. —D. The electrons in atoms orbit the nucleus. ——. Each atom is composed of positive and negative charges.