What is the probability of rolling either a 7 or 11 on a single roll of a pair of dice?
A. 1/6
B. 2/9
C. 3/8
D. 1/3
E. 1/2
Answer: B
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Why are Cepheid variables important to understanding the formation of the Universe?
A) Because they rotate at known speeds. B) Because their brightness is a function of distance from Earth. C) Because their luminosity is a function of their pulsation period. D) Because they are at known distances from Earth.
The atmosphere is divided into several layers. The troposphere is the
A) lowest and thickest layer, where Earth's weather occurs. B) lowest and thinnest layer, where Earth's weather occurs. C) atmosphere's third and thickest layer. D) lowest and least dense layer in the atmosphere, where Earth's weather occurs.
In both fission of uranium and fusion of hydrogen, mass
A) decreases. B) remains constant. C) increases.
A diatomic molecule is vibrating in its first excited quantum state above the ground state
In that excited state, its frequency is 2.0 × 1013 Hz. What is the energy of the molecule in this state? (h = 6.626 × 10-34 J • s, h = 1.055 × 10-34 J • s, 1 eV = 1.60 × 10-19 J A) 0.041 eV B) 0.083 eV C) 0.15 eV D) 0.12 eV E) 0.17 eV