13. The photoelectric effect is (a) due to the quantum property of light (b) due to the classical theory of light (c) independent of reflecting material (d) due to protons. 14. In quantum theory (a) the position and speed of a particle are independent (b) the energy and time interval are independent (c) a slow moving particle can overcome a barrier (d) none of the above. 15. Which of these spectrum lines from hydrogen are in the visual range? (a) Balmer series (b) Paschen series (c) Lyman series (d) none of the above. 16. A meter moves to the right with half the speed of light. To an observer at rest (a) it is elongated (b) it is foreshortened (c) it is still one meter (d) none of the above. 17. A proton is observed at a fixed position. In quantum mechanics you, (a) cannot tell its velocity (b) cannot predict its nomentum (c) cannot predict its kinetic energy (d) all of the above. 18. A moving flashlight (a) produces light with the speed of light (b) produces light with greater speed (c) produces light with smaller speed (d) none of the above