The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 18 µCi. (1 Ci = 3.7 × 10^10 decays/second)
a. 1.2 × 10^9
c. 8.0 × 10^8
b. 3.4 × 10^11
d. 2.1 × 10^10
D
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The variable r that appears in the equation F = Gm1m2/r2 is
a. the straight-line distance between the centers of the two masses. b. the rate at which both objects are moving. c. the radius of the first mass. d. the radius of the second mass.
In an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much work is done on the gas during this process?
A) 0 J B) 50 J C) -50 J D) 25 J E) -25 J
The type of detector that uses liquid hydrogen is a
A) Geiger tube. B) spark chamber. C) scintillation counter. D) cloud chamber. E) bubble chamber.
When the temperature of a quantity of 0°-C air at constant pressure is lowered by 1 degree, its volume
A) shrinks by 1/273. B) shrinks by 100/273. C) increases by 1/273. D) increases by 100/273.