Radio waves that diffract more around small buildings are
A) AM.
B) FM.
C) both diffract equally
Answer: A
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Motional Emf: A conducting rod whose length is ? = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 2.20 T is applied perpendicular to and out of the paper. What is the magnitude of the external applied force needed to move the rod to the right with a constant speed of 6.00 m/s?
A. 8.60 N B. 9.30 N C. 10.6 N D. 12.6 N E. 18.6 N
Let "m" represent the mass of an electron, and "c" represent the speed of light. In order to create an electron-positron pair, we must start with a photon whose energy is
A) at least mc2. B) at least 2mc2. C) at least 4mc2. D) any value greater than zero. E) Actually it is impossible to create such pairs from photons.
No radionuclides decay by emitting
a. protons. b. alpha particles. c. electrons. d. gamma rays.
If the momentum of one object changes in a system that is subject to no net external force, what else must happen?
a. The momenta of the other objects in that system change in the same way. b. The momenta of the other objects in that system change to cancel out the first change. c. The momenta of the other objects in that system are not necessarily affected. d. The momenta of the other objects in that system are necessarily not affected. e. Collisions with other objects will change its momentum back.