Question

wave is incident at a series of three ariers ech with polarieation angles as shown in the figure. The incident wave has an average intensity of 2000 Wm TA 2. 30P TA TA x. 18. What is the intensity l transmitted by the stack of polarizers A) 235 Wm2 B) 475 Wm 796 W/m C) 1130 in D) 1 130 W/m? E) 1320 Wm 19. In the photoelectric effect, the minimum frequency for electrons to be emitted from a surface is 4.5 x 10 HaWhat is the work function of this metal? (1 eV-1.6x 1019 ) A) 1.86 eV B) 2.34 eV C) 3.12 eV D) 3.71 eV E) 4.28 eV 20. If two devices are wired in parallel: A) Each device has the same resistance B) The same voltage is applied to the 2 devices C) The same current flows through the 2 devices D) They have the same capacitance E) They have the same inductance 21. An electron is in the ground state of a hydrogen atom. A photon is absorbed by the atom and the electron is excited to the n-2 state. What is the energy in eV of the photon? A) 1.51 eV B) 3.40 eV C) 10.2 eV

Answer 1

19) no0 -hf 2y 1 1o x lo x10 = 1.856 eV optin A

20) Option B: same voltage