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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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.
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
A successful theory of the formation of the solar system must explain:
A) that all planets rotate in a prograde sense. B) that all planets have elliptical orbits with high eccentricities. C) the existence of the asteroid belt between Jupiter and Neptune. D) that the inner planets have more hydrogen and helium in their atmospheres than do the outer planets. E) all observed properties of the solar system.
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