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Fa08-MT1-Huang-Exam

# Fa08-MT1-Huang-Exam - University of California Berkeley...

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University of California, Berkeley Physics 7B, Fall 2007 ( Xiaosheng Huang ) Midterm 1 Friday, 10/3/2008 6:00-8:00 PM Physical Constants: Avogadro's number, N A : 6.02×10 23 Gas Constant, R : 8.315 J/mol·K Boltmann's Constant, k B : 1.38×10 -23 J/K Stefan-Boltzmann Constant, σ : 5.67×10 -8 W/m 2 ·K 4 Specific heat for water: c =4.19 × 10 3 J/kg· o C Heat of vaporization for water: L V =22.6 × 10 5 J/kg Heat of fusion for water: L F = 3.33 × 10 5 J/kg Note: Formulaic answers may only involve the quantities given in a problem and constants. 1) (15 pts.) The mean free path of CO 2 molecules at STP is measured to be about 5.6 × 10 -8 m. Estimate the diameter of a CO 2 molecule. Formulaic Answer: Numerical Answer:

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2) (15 pts.) Five multiple choice questions: (i) The blackbody radiation of an object depends on its temperature. The total amount of energy radiated is proportional to a ) T . b ) T 2 . c ) T 3 . d ) T 4 . (ii) When He I (normal He) turns into He II (superfluid He), as seen in the video shown during class, the boiling all of a sudden stops. This is due to the fact that a ) heat conductivity of He increases by a large factor.
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