1045 Fa06 Test 4 ans

# 1045 Fa06 Test 4 ans - Name……………………………………… Recitation Section ……………… 1045C Test 4 Fall 06 Monday 20th

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Name……………………………………… Recitation Section ………………. . 1045C Test 4 Fall 06 Monday 20 th November – 45 minutes Show all your working to gain full credit. Equations and constants you may find useful : - c = 3 x 10 8 m/s h = 6.6 x 10 -34 J.s E(photon) = hν c = νλ N A = 6 x 10 23 /mole Rydberg constant = 1.1 x 10 7 /m de Broglie λ = h / mv electron mass = 9.1 x 10 –31 kg 1 Calculate the frequency of ultra-violet light of wavelength 175nm. ν = c/λ = 3 x 10 8 m/s / 175 x 10 -9 m = 1.71 x 10 15 Hz 3 2 Calculate the energy of a green photon (λ = 500nm). E = = h.c/λ = 6.6x10 –34 x 3 x 10 8 m/s / 500x 10 -9 m = 4.0 x 10 -19 J 4 3 Calculate the energy of 0.2 mol of red photons ( ν = 5 x 10 14 Hz) E = hν per photon = n.hν for n photons = 0.2 x 6 x 10 23 photons x 6.6 x 10 -34 J.s x 5 x 10 14 = 39.6kJ 4 4 Use the Rydberg equation {1/λ = R( 1/n 1 2 – 1/n 2 2 ) }to calculate the wavelength of a photon emitted by a hydrogen atom changing from the level n = 6 to n = 3. In which

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## This note was uploaded on 04/20/2008 for the course CHM 1045 taught by Professor Bush during the Fall '08 term at FSU.

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1045 Fa06 Test 4 ans - Name……………………………………… Recitation Section ……………… 1045C Test 4 Fall 06 Monday 20th

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