A headwaiter at a restaurant decides to apply the exclusion principle to the seating of patrons. He will treat tables as sub-shells, and will only seat patrons if the number of the people to be seated adds up to a complete sub-shell. Of the numbers below, the number he would not be willing to seat at one table is
a. 2.
b. 4.
c. 6.
d. 10.
e. 14.
b
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X-Ray Diffraction: Certain planes of a crystal of halite have a spacing of 0.399 nm. The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface. What is the wavelength of the x-rays?
A. 0.14 nm B. 0.17 nm C. 0.21 nm D. 0.24 nm E. 0.27 nm
When a crate slides down an incline at a constant velocity it is
A) in dynamic equilibrium. B) not in dynamic equilibrium. C) in a state of being in and out of dynamic equilibrium. D) none of the above
A clear plastic sandwich bag filled with water can act as a crude converging lens in air. If the bag is filled with air and placed under water, the effective lens is
1.converging 2.diverging
What total energy is stored in the group of capacitors shown if the potential difference Vab is equal to 50 V?
a.
48 mJ
b.
27 mJ
c.
37 mJ
d.
19 mJ
e.
10 mJ