PHYS222 FinalSpring2007

PHYS222 FinalSpring2007 - PHYSICS 222 NAME FlNAL EXAM...

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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 light-years, what is the distance as measured in a spaceship going to the star at 0.8 c? - a. 6.3 light-years b. 5.01ight-years c. 4.01ight-YBars x d. 3.0 Eight-years ' O<W I "‘9 X : (.gcs.’ :- ‘9‘- " c” L _ 57-0 11! __ ._...___———-—v .é 7 3' lo I L : 0 (0/ (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 6. 2c 0 T F345 BL" KM L M0 ‘1 #331— (0:1)" =37”=d’/09 : L1,»; :2 i {£919 o 1”?» 1 W2, ‘ X :Z -21 z .2 1L: 0": .L. c, 2.: 0.7076. (10) 3. One star appears blue—white while another appears yellow-orange. Ifthis is caused by temperature difference, then hr]? 1’ ' the blue-white star is hotter / a. b. the yellow-orange star is hotter :- ‘p r c. the blue-white star is brighter R w /' 5’ I 'e d. the yellow-orange star is brighter (10) 4. What is the energy of a photon that has the same wavelength as a 100-eV electron? a. 506V 1 7- 'Iq‘ :: 333:2; 7W = We“ ""’“" I d. 10,000ev 7 CV _ :: [$305, 2?— r ,3] A1 P .-__ MU,é-1Xlo 2'_ 2(1.‘9XIOJ I _ _ c U — fl—F—é‘l K .QKIOMZ) or"le 1‘7 , 6 z 5.4 Kw he; 3 A w /\ 7' T’H'zq fl '5' 9,1030 ’29.; I I“ H -34 Q .41" by: hf : (“cams sf» : Lamp .7’ 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 half-life 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 we swfzqfszwz I V v .2 1. -ll " I 2: 9 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 A5“ - 9! Tr Z Xlgwof— -s’ 7. 5.17m: [4999)" X 1—HT ($96113); E zé -- z: 14.4 XI 3' 15 luv 7 D T 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?+o-t.% all} iii/Lg, Ax” if” ‘5 " - an? “ = at ,2 kl =' 5” ht- X 0024/; 7— J7, E I Z '0 00th; 1'. ’0 in u» ,L M- Fwy ...
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PHYS222 FinalSpring2007 - PHYSICS 222 NAME FlNAL EXAM...

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