Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?
A)
1.4 × 106 m/s
B)
1100 m/s
C)
2200 m/s
D)
0
E)
1.1 × 106 m/s
A
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Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. What is the general trend in elemental abundance?
A) Elements with more protons are less abundant. B) Elements with more protons are more abundant. C) Elements heavier than iron do not exist. D) Elements heavier than iron are relatively abundant. E) There is no apparent trend in the abundance of elements.
The color of light that is LEAST useful for the growth of green plants is:
a. Red b. White c. Blue d. Green
The Group 7A element astatine (85At) would be predicted to occur in what phase?
a. Liquid b. Solid c. Plasma d. Gas
A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2 . Determine the tension in the string
a. 11 N b. 70 N c. 48 N d. 59 N e. 62 N