Molecular Rotation: A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10-45 kg ? m2. What is the rotational energy when it is in the quantum state characterized by L = 2? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2.27 × 10-5 eV
B. 2.70 × 10-5 eV
C. 7.22 × 10-5 eV
D. 8.71 × 10-5 eV
Answer: B
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A large 8 ft by 4 ft thermopane glass window loses 300 Btu/hr of heat when the inside temperature is 70ºF. If the thermopane has an average thermal conductivity of 0.032 Btu/hr·ft·ºF and is ½ inch thick, estimate the outside temperature of the window.
What will be an ideal response?
The ____________________ is a measure of the clarity of the atmosphere
Fill in the blank(s) with correct word
X-rays of energy 2.9 × 104 eV are scattered by a free stationary electron through an angle of 135°
What is the energy of the scattered x-rays, in electron volts? (mel = 9.11 × 10-31 kg, e = - 1.60 × 10-19 C, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
Our local group is situated
A) within a major supercluster. B) directly between two major superclusters. C) relatively distant from any supercluster.