At what core temperature does hydrogen begin to fuse to helium?
A) 3,000 K
B) 5,800 K
C) 1 million K
D) 10 million K
E) 100 million K
D
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The Large and Small Magellanic clouds are satellites galaxies of the Milky Way
Indicate whether the statement is true or false
A telescope performs best:
A) on a high mountaintop where the air is thin and steady. B) in a valley where the air is calm. C) on a hill close to the ocean where the atmospheric turbulence is high. D) close to a valley where the seeing is poor.
The person who first explained the blackbody spectrum was __________
Fill in the blank(s) with correct word
The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 1.9 µCi. (1 Ci = 3.7 × 10^10 decays/second)
a. 5.9E–2 b. 2.2E+9 c. 1.5E+9 d. 6.1E+5 e. 4.2E+5