Which of the following is true of an isothermal process?
A. Temperature is constant.
B. ΔU = 0
C. Volume is constant.
D. W = Q

Can be multiple answers

Question

Which of the following is true of an isothermal process?
  		A. 	Temperature is constant.
  		B. 	ΔU = 0
  		C. 	Volume is constant.
  		D. 	W = Q

Can be multiple answers

priyar · Answer

1."isothermal" means same temperature..so temperature doesn't change. 
 2.internal energy changes with temperature..so if temp. doesn't change, internal energy will also not change.
3.also use first law of thermodynamics to decide upon the last option..
so what will be the answers.. ? @Schoolninja7

anonymous · Answer

A and D

priyar · Answer

how?

priyar · Answer

how D?

anonymous · Answer

It's not b or d I meant a and c

priyar · Answer

no..thats wrong... how did u arrive at this answer...read the abv text carefully

priyar · Answer

@Schoolninja7 ?

anonymous · Answer

I looked up that ∆U=W is isothermic  so b is wrong I t guessed for b an d so if their wrong a is the only answer?

priyar · Answer

"∆U=W is isothermic " this is wrong...

priyar · Answer

temp is const. which means ∆U is zero. first law of thermodynamics is ∆U=W +q
so 0=W+q so -W=q or W=q (since sign convention differs).

priyar · Answer

therefore all are correct except C. any doubts?

frostbite · Answer

Perfect explanation by @priyar, just remember the internal energy of a real gas is also a function of volume, so we here assume we work with an ideal gas.