Fermium-253 has a half-life of 3.00 d. A sample of fermium contains 7.37 × 107 nuclei. How long will it take for there to be only 3.36 × 106 fermium nuclei in this sample?
A) 2.75 d
B) 9.80 d
C) 13.4 d
D) 15.7 d
E) 58.6 d
C
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Energy in the Electric Field: Each plate of a parallel-plate air-filled capacitor has an area of 0.0040 m2, and the separation of the plates is 0.020 mm. An electric field of 8.2 × 106 N/C is present between the plates. What is the energy density in the region between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 300 J/m3 B. 200 J/m3 C. 400 J/m3 D. 500 J/m3 E. 610 J/m3
A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ? at 20°C and increases to 3.072 ? as indium just starts to melt
What is the melting point of indium? The temperature coefficient of resistivity for platinum is 3.927 × 10-3/C°. A) 136°C B) 351°C C) 156°C D) 116°C
When two gases separated by a diathermal wall are in thermal equilibrium with each other:
A. it rises to the ceiling B. it sinks to the floor C. it stops expanding D. it starts to contract E. none of the above
The magnetic fields of a pair of nearby magnets can
A) only add. B) cannot add or subtract. C) add or subtract by vector rules.