1045 Fa06Test 4 ans - pink version

# 1045 Fa06Test 4 ans - pink version -...

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Unformatted text preview: Name……………………………………… Recitation Section ……………….. CHM1045C Fall 06 Test 4 Monday 20 th November – 45 minutes Pink 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 infra-red light of wavelength 920nm. ν = c/λ = 3 x 10 8 m/s / 920 x 10 –9 m = 3.26 x 10 14 Hz 3 2 Calculate the energy of a blue photon (λ = 400nm). E = hν = h.c/λ = h x 3 x 10 8 m/s / 400x 10 –9 m = 4.95 x 10 –19 J 4 3 Calculate the energy of 2 mol of green photons ( ν = 6 x 10 14 Hz) E = hν per photon = n.hν for n photons = 2 x 6 x 10 23 photons x 6.6 x 10 –34 J.s x 6 x 10 14 = 475kJ 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 = 5 to n = 3. a photon emitted by a hydrogen atom changing from the level n = 5 to n = 3....
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1045 Fa06Test 4 ans - pink version -...

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