PHYS222 Final2Spring2007

PHYS222 Final2Spring2007 - PHYSICS 222 NAME FINAL EXAM...

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Unformatted text preview: PHYSICS 222 NAME FINAL EXAM (PLEASE PRINT) MAY 7, 2007 [Elite your name on the hack of the exam! (10) 1. pile proton is_ moving at speed 0.4 c and another proton is moving at speed 0.8 c. The rate of the relatxvistic mass of the faster proton to that of the slower is . 1.0 l A :- .U’:.L{C— "" c. 2.0 ['23, d. 2.3 c V“-S’c'K=""—'m:/oév Mia- : liq/mo Mi. 1.64 _ « Marv La? “#53 (10) 2. Ifthe kinetic energy of an electron is equal to its rest energy, what is its speed? a. 0.5a b. 0.71 , 1' .. 3. 0.87: : (M vifl'AC :: to =flloc .c t a L WC- "Ma‘ ': Mac L L /m C ': Z/Mac 92 .. ._.__l___._..—— 1.. 2. ' ‘ 4’1.- :- .. 2.2-, 11‘ EL IUL 57 F .. .. 5 _. :9.— " ‘2? U” 1" C- "‘ (10) 3. Blackbody radiation is fiom a body that FL.“ 9'!” is black absorbs all radiation falling on it is actually white does not emit radiation in the visible Pct’ L6; AVAS‘aVLKV" (10) 4. In the non—relativistic case, doubling the speed of an electron causes its wavelength to 51.0 53's» double A quadruple ._ halve "' "—."'"' decrease by a factor of four a m 1);) 4f 5 2/96, A : A fin Z 2. V0\ /\ h: 2 m V: (10) 5. Suppose a wave function were assumed to be given by 1|; = A from x = a to x = b, I]! = 0 elsewhere. Normalization yields what value for A? 1 b-a . (Ii—a)" b a)-0.5 .n-nsrt» A Mir-43" a; ___|_._ A" H A c— ‘ L”l (10) 6. A radioisotope has a half-life of 15 days. Ifa sample of this radioisotope has an initial activity of 6.4 x 10‘ decays/s, what will be its activity alter 60 days? a. 0 b. 1.6 x 106 decays/s c. 0.8 x 106 decays/s d. 0.4 x 106 decays/s l 7. N “at; 4,211+!!— ——a 2- ‘f 8 (15) 7. The intensity of radiation at the surface of the Earth is 1300 Us m2. Calculate the temperature of the sun. The radius of the sun is about 7 x 108 m and the earth is about 1.49 x 1011 m from the sun. W/A'rxloiffl» O (13* 1'- lawf— m em S'M‘ ll 2‘ E) 5‘: Hrr J.qu max” "’5 sup 5’" 7/63” :: 3 (99/00 /5 L 7' 5m» Rwy: V T” 7—— TLI __ 5197K") 'ZM-z. mung» " sfwmo’rw : /‘ (4'31"? 3 SEE QM II ON HOB/[EPAGE FOR WAVEFUNCTION THEN . an. (X) = it 'FJx : "’ a F If 0 ‘5 . ‘6‘ 3% v‘? «I. O 5 a .. i a. t “f‘. I: "h . IE9 94.4% x {e $53M a h a 'tfl'flx s a X 5M '2- Al é a ...
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PHYS222 Final2Spring2007 - PHYSICS 222 NAME FINAL EXAM...

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