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HW8solution08

# HW8solution08 - Version PREVIEW – HW – Savrasov –(39...

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Version PREVIEW – HW – Savrasov – (39 24) 1 This print-out should have 9 questions Multiple-choice questions may continue on the next column or page – find all choices before answering Double the RMS Speed 001 1 points A gas is at 35 C To what temperature must it be heated to double the rms speed of its molecule Correct answer: 959 C Explanation: Let : T i 35 C 3 K . v f,rms 2 v i,rms At a given temperature, the kinetic energy is K 1 2 v 2 rms 3 2 k B T Thus T f T i 1 2 v 2 f,rms 1 2 v 2 i,rms (2 v i,rms ) 2 v i,rms 4 . T f 4 T i 4 (3 K) 1232 K 959 C Hydrogen Thermal Energy 002 1 points A box contains about 6 . 6 × 1 21 hydrogen atoms at room temperature 21 C ind the thermal energy of these atoms Correct answer: 41 . 74 6 J Explanation: Given : N 6 . 6 × 1 21 and T 21 C K . Thermal energy for one atom is E 3 2 k T, so the thermal energy for N atoms is E 3 2 N k T 3 2 ( 6 . 6 × 1 21 ) ( 1 . 3 × 1 23 J / K ) × (294 K) 41 . 74 6 J .

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HW8solution08 - Version PREVIEW – HW – Savrasov –(39...

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