The source of magnetism is
a. polarization.
b. magnetic monopoles.
c. electrons.
d. protons.
c
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The Bohr model of the atom is akin to a
A) miniature solar system. B) blob of plum pudding, where raisins represent electrons. C) central heavy ball with lighter balls connected by springs. D) all of the above
If an x-ray machine were designed to operate at two separate accelerating voltages, one double the other, how would the shortest wavelength, ?min,h?, and the maximum frequency, fmax,h?, at the higher voltage compare to those (?min,lv, fmax,lv) at the lower voltage? ?min,hv/ ?min,lv = ________, fmax,hv/ fmax,lv =________:
a. 2, 2. b. 2, 1/2. c. 1/2, 2. d. 1/2, 1/2.
Van der Waals bonding is caused by
A) the sharing of electrons between atoms. B) the transfer of electrons between atoms. C) unequal charge distribution around neutral molecules. D) atoms bonding to hydrogen molecules. E) atoms bonding to oxygen molecules.