Question

Question 15 5 pts Ascapfilm in- 1.33) sits on top of a plastic platein - 1.37). White light strikes the film nearly perpendicularly. The smallest nonzero filin thickness for which the film appears bright due to constructive interference is 153 nm. What color does the film appear? o Vialet (420 nm) o Yellow (580) Rod 650 nm o Blue 1475 nm O Groen 1500 ml Question 16 5 pts Use the Bohr model tonind the second longest wavelength of light in the Balmer series for a doubly lonized LI atom iz - 31. Recall that the Balmer series corresponds to transitions to the n-Z level. 04110m O 117 nm o 73.0 nm o 54.1 nm 209 nm Question 17 5 pts The maximum speed of photoelectrons ejected from the surface of a metal is 4.07E5's, when light with a wavelength of 185 nm is shined on the surface. What is the work function of the metal? 2.40 05.17 V O 624 ev 0 4.70 V 0 142 ev

Answer 1

O for constrictive antă ma de 2x137 153 d=420nm (optional) 2 f. Rz²[ & the Z=3 R=1.1x107 ml nizu i ni=2 HX10X9X[t - Yo) da 54.1 nm