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quiz3_sol

# quiz3_sol - Qui z 3 Solu tio n s Q1 The fir s t law of t he...

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Unformatted text preview: Qui z 3 Solu tio n s Q1: The fir s t law of t he r m o dy n a mics for a ga s is, U= Q- W . When t he re is n o t h e a t a d d e d t o t h e sys te m Q=0. Furt he r m o re t h e sys te m is exp a n di ng w hich m e a n s t h a t its in ter n al e ne rgy will d ecreas e beca u s e it will d o work o n its s u r r o u n di ngs a n d t h e wo r k t h e ga s d o e s is al wa y s p o sitive. Therefore, U=-W W =100J U=-100J Q2: The cha nge in e n t ro py of a gas whe n 2 0 0J of e ne rgy a re a d d e d a t a c on stant te m p erature is give n a s: Q S = T If t h e te m p e r a t u re of t he gas is 25o C co nver t t o Kelvin w hich is (25 + 2 7 3)K = 2 9 8K t h e n, S = Q3: 200J J =0.67 298K K The e ne rgy of a x - ray p h o t o n or a ny p h o t o n is given by, hc E= =h w h ere is t he frequ e nc y of t he p h o t o n. E=h =6.610-34 Js 11019 Hz =6.610-15 J ...
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