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H133_quiz2_key - Name XK Physics H133(Spring 2011 Quiz#2...

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Unformatted text preview: Name: XK Physics H133 (Spring, 2011): Quiz #2 Full credit : 10 points Possibly useful relations: U = )‘f k’ = i2 w = 27Tf dsin 9m: 2 n/\ asin and :: m\ A:@_ A=L E_hf_E~1240€\/.nm thfgu, p 2(m02)K A /\ 1. (3pt5) anode f, I cathode For the experiment shown in the figure. niark EACH of the following possible results (if seen) for the final potential difference. W, as being consistent or inconsistent with the particle model of light: a) Vf varies as the lights wavelength changes Explain (briefly!) your responses. (1 point total for correct answers, 2 points total for correct explanations.) ‘ 1 ~ «\R gm .ng ‘6 MQfm‘th bqjm marinate MM, {mam KW 5? heft/3' g t in chltdkL Whaler” (NF i & 1‘03“th "W : . ‘ ~ , v L -1 30 \It stale} be wiltiemthdi‘ Oillk‘mmel‘tt i“ “ii 0% {\mm '30 'b\ mi <3 cm immatszle WWW ‘3 Cm‘ég‘fi' Th (t‘wwi’g ‘5 9: 5/) )30 V? W 05.“ Moi/BMW) p ‘QWS’ ‘50 03 its toe min (note int 3:3 l8 he 0 WW“ COWM “‘léiai) ~ 2. (3 pts) Assume that in the above experiment the following readings are obtained: When illuminating the cathode with light of wavelength /\ : 31011111 the maximum potential finally reached is Vf : 2.1 V. Determine the work function of the cathode material (2pts) and explain the meaning of the work function (1th). Tu “Cd: Slwajm ‘5 $0» i;\\f\\fl",\>\(‘fl e90: Wmiwai (Bib his; an {Mid “‘ \ ff) \ KM“: M") 37 “‘ fibrin“. r x i9 \a‘m 2W he a m. . 9“ \i 1 WWW yaw a 790 pm 3. pts) If the value of h (Planckls constant) were much smaller. it would be easier to observe interference effects in macroscopic objects: 4(a)...“ “rue Explain your response! (1 pt for correct answer. 1 pt for correct explanation) T"‘§éc&§“‘“& air/Wit we wit/2r is 0532ch \am’) Crossfire ' ‘ ‘ ' rt A x i &——< . A\‘b (like CAij § Go ~ @56ka Q smoqbp V7 \I‘ M93 gouge-‘1“ wmuc‘fis: 50 R'be “GNOTUM {y (flewmpgg To 4. (2 pts) Suppose you have a beam of free particles. each with the same nonrelat ivistic kinetic energy. If you now increase the kinetic energy by a factor of four. what happens to the beam’s de Broglie wavelength? Explain your response! (1 pt, for correct answer. 1 pt for correct explanation.) (a) It increases by a factor of 4. ,n \>\ (b) It decreases by a factor of 4. (C) it increases by a factor of 2. z / a “ ‘ ‘ A ‘7) T @It decreases by a factor of 2. (X; \x ‘yt‘aifi‘t’QSt‘S hm‘ (A MC} Q C% hour, ‘ .V! c A J t! A; a r (c) It stays the same. Wig bowmnukfif (M13035 ) 50 > Getttli‘i‘QS log a fat 0? 3f 3, ...
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