If a nucleus has excited states above the ground state at 300 keV, 200 keV, and 80 keV, what gamma rays (in keV) may be expected from a collection of these excited nuclei? Choose the most complete set.
A. 300, 200, 80
B. 300, 200, 120, 80
C. 100, 120, 80
D. 300, 120, 200, 80, 180
E. 300, 220, 200, 120, 100, 80
E. 300, 220, 200, 120, 100, 80
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According to general relativity, what is a black hole?
A) a hole in the observable universe B) an object that cannot be seen C) a place where light travels slower than the normal speed of light D) a place where the strength of gravity is infinite
If there were no gravity, a cannonball fired upward at 45° would follow a straight-line path. Due to gravity, however, at the end of 3 s it is
A) 5 m below the straight line. B) 10 m below the straight line. C) 15 m below the straight line. D) 20 m below the straight line. E) more than 20 m below the straight line.
The statement, "There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation" is
A) a fact. B) speculation. C) a hypothesis. D) a scientific statement. E) a theory.
Boris completely filled a 2.5-liter container with gasoline at a temperature of 20°C. He then left the gasoline in a storage locker where the temperature reached 38°C. The lid of the container was not screwed on tightly, so gasoline was able to leak out and evaporate. Boris uses the gas in his scooter, which gets 35 km/liter. How far could Boris have ridden his scooter using the lost gas?
(?gasoline = 9.6 × 10^–4/°C) a. 4.7 m b. 43 m c. 1.5 km d. 180 km