Tritium (3H) has a half-life of 12.3 years and releases 0.018 6 MeV energy per decay. What is the rate at which energy is released for a 1.5-gram sample of tritium? (NA = 6.02 × 10^23 mol–1, 1 year = 3.16 × 10^7 s, 1 MeV = 1.6 × 10^–13 J, and mt = 3.016 05 u)
a. 1.6 W
b. 2.3 W
c. 9.9E+12 W
d. 5.0E+7 W
e. 85.4 W
a
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Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers
What sound intensity does the other student measure? Assume that the sound spreads out uniformly and undergoes no significant reflections or absorption. A) 6.2 × 10-8 W/m2 B) 1.5 × 10-7 W/m2 C) 8.3 × 10-8 W/m2 D) 7.8 × 10-7 W/m2 E) 2.5 × 10-8 W/m2
When should we next expect to observe a transit of the Sun by Mars?
A) Never B) 2035 C) 2030 D) 2148
The Sun's atmosphere consists of the ________ and the ________.
A. chromosphere; corona B. photosphere; chromosphere C. photosphere; corona D. corona; solar wind
The brightest object in the sky is
a. the Sun. b. the Moon. c. Venus. d. Mars.