The energy of an electron state has an uncertainty of about 0.500 eV. What is the uncertainty in the lifetime of the level?
A)
1.32 × 10-15 s
B)
8.28 × 10-15 s
C)
1.32 × 10-11 s
D)
8.28 × 10-11 s
E)
1.32 × 10-8 s
A
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Calculate the ground state energy of a harmonic oscillator with a classical frequency of 3.68 × 1015 Hz. (1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s)
A) 7.62 eV B) 15.2 eV C) 11.4 eV D) 5.71 eV
Why does the Moon have a layer of "powdery soil" on its surface?
A) It is the result of countless tiny impacts by small particles striking the Moon. B) Recent, large impacts shattered lunar rock to make this soil. C) It is made by the same processes that make powdery sand on Earth. D) It exists because the Moon accreted from powdery material after a giant impact blasted the Earth.
A successful theory of the formation of the solar system must explain:
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The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air, how long does it take the football to reach the top of its trajectory?
A) 1.0 s B) 2.0 s C) 3.0 s D) 4.0 s E) 5.0 s