11.Thermodynamics
medium

અચળ દબાણ $100\, N/m^2$ એ વાયુનું કદ $2\,m^3$ થી $1\,m^3$ થાય છે.પછી તેને અચળ કદે ગરમ કરવા $150\, J$ ઉષ્મા આપવામાં આવે છે. વાયુની આંતરિક ઉર્જામાં કેટલો ફેરફાર થાય?

A

$250\, J$ વધે 

B

$250\, J$ ઘટે 

C

$50\, J$ વધે 

D

$50\, J$ ઘટે 

(JEE MAIN-2014)

Solution

As we know, $\Delta Q=\Delta u+\Delta w$

(Ist law of thermodynamics) $\Rightarrow \Delta \mathrm{Q}=\Delta \mathrm{u}+\mathrm{P} \Delta \mathrm{v}$

or $150=\Delta u+100(1-2)$

$=\Delta u-100$

$\therefore \Delta u=150+100=250 \mathrm{J}$

Thus the internal energy of the gas increases by $250 \mathrm{J}$

Standard 11
Physics

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