One of the first atomic explosion released approximately 1.0 × 1014 J of energy. How much matter had to be changed into energy to produce this yield? (c = 3.0 × 108 m/s)
A) 1.1 g
B) 23 g
C) 13 g
D) 0.45 kg
E) 1.1 kg
A
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Some globular clusters have three main sequence tracks. This indicates:
A) three different stellar compositions. B) three episodes of star formation, separated by billions of years. C) stars evolve through three different mechanisms. D) the stars were observed from three different telescopes.
What properties of degenerate matter are important to the structure of stars? Why?
What will be an ideal response?
A convex mirror has a focal length of ?20 cm. What is the object distance if the image distance is ?10 cm?
a. 10 cm b. 40 cm c. 60 cm d. 20 cm e. 30 cm
A nova is caused by the ignition of ____
a. hydrogen fusion in material on the surface of a white dwarf b. carbon fusion in a white dwarf core c. helium fusion in the core of a massive red giant d. silicon fusion in the core of a high mass star e. iron fusion in the core of a high mass star