If a resonance had a width of 100 keV, what would be the corresponding lifetime associated with the particle?
A)
7 × 10-24 s
B)
7 × 10-21 s
C)
2 × 10-20 s
D)
4 × 10-20 s
E)
7 × 10-23 s
B
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The universe formed Helium nuclei in a process called nucleosynthesis. At that time, what fraction of the mass was converted to Helium nuclei (2 protons and 2 neutrons)?
A. 2 percent B. 50 percent C. 25 percent D. 99 percent E. 1 percent
Parallel-Plate Capacitor: An ideal air-filled parallel-plate capacitor with horizontal plates has a plate separation of 5.0 cm. If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what are the magnitude and direction of the electric field between the plates?
A. 100 N/C upward B. 100 N/C downward C. 40,000 N/C upward D. 40,000 N/C downward
A 10-V battery is connected to a 15-? resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-? resistor in 2.0 min?
a.
0.40 kJ
b.
0.19 kJ
c.
0.29 kJ
d.
0.72 kJ
e.
0.80 kJ
Saturn's upper atmosphere has an apparent helium surplus
Indicate whether the statement is true or false