Question

13. A photon has an energy of 5.53 x 10-17 J. What is its frequency in s'? [h-6.63 x 10"Js). (4) 14. Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation (c = 3.0 x 10 m/s; h = 6.63 x 10-34 J·s). A) B) C) 4.1 x 10-9 J 4.1 x 10-30 J 3.2 x 10-29 D) E) 3.2 x 10-26 J between 10-20 and 10-19 J 15. Calculate the energy, in joules, required to excite a hydrogen atom by causing an electronic transition from the n=1 to the n = 4 principal energy level. Recall that the energy levels of the H atom are given by En = -2.18 x 10-18 J(1/nº). a) 8.72 x 10-20 J -8.72 x 10-20 5.45 x 10-17J 2.04 x 10-18 - 2.09 x 10-18 J

Answer 1

13) Planks constant, h= 6.63x10-34J.s Energy, E = 5.53x10-17 J Energy of the incident light, E = hu Frequency, w= 5.53x10-1 J 56.63x10-3* J.s = 8.34x1046 -2