Molecular Rotation: Estimate the maximum rotational energy (in electron-volts) for a free and freely-spinning diatomic hydrogen molecule in the L = 2 quantum state. The equilibrium separation for the atoms in the H2 molecule is 0.075 nm. (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s)
A. 0.011 eV
B. 0.022 eV
C. 0.033 eV
D. 0.044 eV
Answer: D
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a. He rotated the barrel of the telescope 180°. b. He used diverging lenses for both the eyepiece and the objective. c. He used a diverging lens for the eyepiece. d. He used a diverging lens for the objective.
Determine the impedance for the circuit.
?
?
A. 600 ? B. 1200 ? C. 1800 ? D. 2300 ? E. 1100 ?
Which of the following radiations has the smallest frequency?
a. Infrared b. Visible c. Ultraviolet d. X-rays
What makes a transition from a higher energy state to a lower energy state when aphoton is emitted by an atom?
a) electron b) proton c) photon d) graviton e) neutron