The angles of incidence and reflection
a. are not related.
b. can never be equal.
c. are measured from a normal to the reflecting surface.
d. add to 90°.
c
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Does the average distance that a neutron travels through fissionable material before escaping increase or decrease when two pieces of fissionable material are assembled into one piece?
Does this assembly increase or decrease the probability of an explosion? A) The average distance increases while the probability of an explosion also increases. B) The average distance decreases while the probability of an explosion decreases. C) The average distance increases while the probability of an explosion decreases. D) The average distance decreases while the probability of an explosion increases.
Chris and Jamie are carrying Wayne on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 100 N. Wayne weighs 800 N. Wayne's center of gravity is 75.0 cm from Chris. Chris and Jamie are at the ends of the stretcher. The force that Jamie is exerting to support the stretcher, with Wayne on it, is
A. 250 N. B. 300 N. C. 350 N. D. 400 N. E. 550 N.
A lens is made with a focal length of -40 cm using a material with index of refraction 1.50. A second lens is made with the SAME GEOMETRY as the first lens, but using a material having refractive index of 2.00
What is the focal length of the second lens? A) -80 cm B) -53 cm C) -30 cm D) -20 cm E) -40 cm
Hydrogen and oxygen molecules in a sample of gas have the same temperature. This means the hydrogen molecules, on average, have the same
A) speed and the same kinetic energy. B) speed, but more kinetic energy. C) speed, but less kinetic energy. D) kinetic energy, but more speed. E) kinetic energy, but less speed.