The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the disintegration constant (in s-1)?
a. 5.6 × 10^-2
b. 5.6 × 10^8
c. 3.2 × 10^7
d. 1.8 × 10^-9
e. 1.6 × 10^6
D
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A. 0°. B. 90°. C. 270°. D. 180°. E. 360°.
How is an x-ray burst (in an x-ray binary system) similar to a nova?
A) Both involve explosions on the surface of stellar corpse. B) Both typically recur every few hours to every few days. C) Both are thought to involve fusion of hydrogen into helium. D) Both result in the complete destruction of their host stars.
The most elongated of the elliptical galaxies are class
A. Irr 1. B. Sb. C. Ea. D. E0. E. E7.
When a 14.0-A current flows through an 8.00-? device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ? h?
A) $0.24 B) $3.39 C) $2.16 D) $1.04