Radio waves were discovered by
A. Hertz.
B. Maxwell.
C. Penzias.
D. Dumont.
E. Marconi.
A. Hertz.
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An ion is released from rest and moves due to the force from an electric field from a position in the field having a potential of 14 V to a position having a potential of 8 V. The ion:
a. must have a positive charge. b. must have a negative charge. c. can have either a positive or a negative charge. d. must be neutral.
A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm b. 0.139 nm c. 0.0695 nm d. 1.02 × 10^?10 m e. 3.47 × 10^?11 m
Two wires are made out of the same metal, but one wire is twice as long as the other wire. Which wire will have the greatest elastic modulus?
A) the shorter wire B) the longer wire C) It will be the same for both wires.
Consider the following reaction. ?+ + n ? ?– + p This reaction is impossible because it violates which conservation law?
a. baryon number b. lepton number c. strangeness d. charge e. two of the above