A light ray enters a glass enclosed fish tank. From air it enters the glass at 20° with respect to the plane of the surface and then emerges into the water
The index for the glass is 1.50 and for water 1.33.
(a) What is the angle of refraction in the glass?
(b) What is the angle of refraction in the water?
(c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection? If so, find it.
(a) 39° (b) 45° (c) no
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To make Helium-4 you need what?
A.) 4 protons. B.) 2 protons and 2 neutrons. C.) 2 protons and 4 neutrons. D.) 4 neutrons. E.) 1 proton and 3 neutrons.
Two objects, A and B, are placed in thermal contact. The entropy of object A decreases. What can be said about the relationship between the temperatures of the two objects?
a. TA < TB b. TA > TB c. TA = TB d. not enough information to say
In the scattering of fast alpha particles by a thin foil of gold, Rutherford and his collaborators observed
A. cathode rays emerging from the foil. B. most of the alpha particles bouncing straight back with very few passing through the foil undisturbed. C. a very few alpha particles scattered through large angles with most undergoing very little scattering. D. alpha particles interacting with nuclei to produce beta rays and alpha particles moving equally in all directions.
The approximate energy needed to ionize the n = 1 (the deepest) state in hydrogen is
a. 10 eV. b. 10 keV. c. 10 MeV. d. 10 GeV. e. 10 TeV.