HW3soln - Chemistry 207 Assignment 3 ""...

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Unformatted text preview: Chemistry 207 Assignment 3 "" Due: Friday, September 21 @2:00pm Name K?— 11 Lab TA Lab DayfTime l hter222272 471 1. Your clickers transmit at a frequency of 915 MHz. (a) Suppose that your seat in Baker 200 is 40 ft from the receiver. Express this distance in clicker wavelengths. (b) Suppose that the electron in a hydrogen atom has the absurdly high energy of -2.690 x 10'12 J. Could this atom absorb photons from your clicker? Justify your answer withanumerical calculation. ' 9 («3 Blame =13“:on Mus—x10 w. z Ml Ho ,3 ‘1." “‘4 >KIHJ. :- A , l‘ (H (31.34" ( 0.3”.“ Ca“ “ab F'ml n. E = "RH ln“ 1 h 2 \l—RH [E : .llutMXIo‘w/z.csmé“z@ ~l View = 3! (—L- ~_-lfiA ; theme 3 (A. “L -\s.nm§Hz la 10" LLLLKNJ“ ‘10" 1i“ (VQF‘J‘ :- QIISKIOYHQL , So Vclfd‘ < Vi‘q’“ fi-«A chnd‘ é L\V1°_"l' /-. Clicktr PliohrwJ lax“; n2.“ 7—” 46h (gswk‘). 1,3 .M H art-m HEW Vtqu Win-u 1 want- nz “in 2. An ion has a single electron. The longest wavelength of radiation absorbed by this ion in its lowest energy state is 7.60 nm. (a) Which ion is this? (b) What is the minimum energy (in units of J) required to completely remove this electron from the ion in its lowest energy state? (“NW Lanacb’l wkvt.‘ @1344» M<sn¢ leugg} (“A31 15¢ Tkk.ah'im with ) 2 3.60m» Cunt; «HA “:1 --; narz Wans'akm . QE : ‘13. ': 1“ ~_L . :31: kc > 2 12"“ 7-3 3EHL3I~5 i : {c.tzcmc’“) (.Z.‘l122rtogl _ \Lr NEH-r «*Mic 44‘ “If qJ‘HfiJ / __________________ __ ) (3.to)¢!o“\(2.n1xlo“”) [3],.” WM” ‘74- CQ DE : Z‘RH (‘ " “ill TICQH =l2flfixlo‘n3“ 3. H atoms in their lowest energy excited state are irradiated with light of frequency 3.510 x 1015 Hz, causing electrons to be ejected. Calculate the de Broglie wavelength associated with these electrons. r.‘ Express your answer in units of the Bohr radius, defined in Eq. (8.4), which is a convenient unit for atomic length scales. -13 Epsom = LN = (L.C.L<.Kls‘3"‘\(liloxlo‘Y) T "2 2.3chto 3' u.“ b E‘ovfiéa’fim (HEM n:l_\ = RH ‘-" S‘d‘l‘fs’XlO 3' Air- (KCCSS Entrow a: king“; {Ag/‘37 0‘: e- 2" — DE:§N‘i‘Rm ‘2 \H‘Jlxlo ) —§-M,_VQ_L = [Atmo‘wS V: = [LCLtho-Wi :\|.°19xto" MS“ ‘ _'——'——-——._—..__ .u Rio-3‘ > T: t L :_ CtCtCXIQ"3q m lO-‘om F ML'U'}, W Chums") (L'Nxts‘i ' ‘:-_ 3.L=l-Kto“‘° :. i >/Qa xla-J) Q 'C\ qo 4. The work function W of a metal specifies the minimum energy required to remove an electron from that metal, and is often expressed as an energy per mole of electrons. For cesium, W=206 kJ mol". (a) A sample of Cs is irradiated with blue light. Are electrons ejected? Justify your answer with a calculation. (b) A sample of Cs is irradiated with light of wavelength 2.95 x 10'?r m. and electrons are A ejected. What is the speed, in ms“, of these electrons? m W: on wxmmu hows M = 2W“? W ( c.6umu""‘)(t.u‘tm o13 3 =\S:lc><lo HAS by» m». ates». > Men >., Wm met 5 «G-m Cs. Since. >51.” < Eye.th LIM hqu (an); a“ (firm CS. (51 V: .3 .- Lstmo” :m 2. Ifkls"? imam} = k(V~\/J . Va = “1L ‘L(c.6u?<:o*"‘\ (l. D'Ptiflw‘ 5‘. Into”) ‘1. h Xt‘o'“ ms “ ...
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This note was uploaded on 03/30/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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HW3soln - Chemistry 207 Assignment 3 &amp;quot;&amp;quot;...

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