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Unformatted text preview: PHYSICS 222 NAME
FlNAL EXAM (PLEASE PRINT) MAY 4, 2007 rite our name on the back of the exam. (10) 1. Ifthe proper distance to a star is 5.0 lightyears, what is the distance as measured
in a spaceship going to the star at 0.8 c?  a. 6.3 lightyears
b. 5.01ightyears
c. 4.01ightYBars x d. 3.0 Eightyears ' O<W
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(10) 2. At what speed would the density of an object double? , 7%
a. 0.71c
b. 0.82c F : Mb
c. 0.87c g
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1L: 0": .L. c, 2.: 0.7076. (10) 3. One star appears blue—white while another appears yelloworange. Ifthis is
caused by temperature difference, then hr]? 1’ ' the bluewhite star is hotter / a. b. the yelloworange star is hotter : ‘p r
c. the bluewhite star is brighter R w /' 5’ I 'e d. the yelloworange star is brighter (10) 4. What is the energy of a photon that has the same wavelength as a 100eV
electron? a. 506V 1 7 'Iq‘
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d. 10,000ev 7 CV
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I.Z§Xle" H.2 X15 4' (10) 5. If a particle is in a box with a ground state energy of 4 eV, what energy must be
absorbed by the system to go from the n = 2 state to the n = 3 state? a. 4eV n. a" b. l6eV :_ mi“? *1 __ Z’C \
c. zoev L " 2 3.. ’m d 36eV Mg E1: ILL) 7' Li'ev (10) 6. The halflife of 226Ra is 1600 years. What is the decay constant of this isotope? a. 9.9x10'ijls
b. 1.4 10' l
c. 4.3:10'3/3S d. 7.3x10m/s >\ ;_ MED L
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I L? XIO/s (15) 7. The sun has a radius of 6.96 x 108 m and a temperature of 6,000 K. What is the
intensity of radiation at a distance of 1010 m from the sun? 4 K .;.A—  0" T: fﬂvae)
T: M0 ‘ m
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7. 5.17m: [4999)" X 1—HT ($96113);
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T  (Lixaw ‘5 ’— (25) 8. For the barrier potential shown ﬁnd the four equations that are needed to obtain
the transmission coefﬁcient. The particles have total energy E less than the potential
barrier V and are in region [B moving in the minus x direction. .. iii—Jail”; _ :: 13 if»: ,
aj?+ot.% all} iii/Lg, Ax” if” ‘5
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 Spring '08
 Adair
 Physics, Energy, Ifthis

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