Giancoli Ch. 27 – p. 784-5, Problems #54, 57, 67, 68, 80, 83, 86 key

54) 91.2 nm

67) 4.66 x 10²⁶ photons/s

68) 2.78 x 10²¹ photons/s•m²

80) 0.88 nm

83b) ground state; 0.4 eV, 2.2 eV, 2.5 eV; also 2.6 eV, 4.7 eV; and 5.1 eV

86) 3.33 x 10⁵² photons/year (wow!)