# NEET Physics Thermodynamics Questions Solved

NEET - 2016

The temperature inside a refrigerator is and the room temperature is . The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be -

(a)$\frac{{t}_{1}}{{t}_{1}-{t}_{2}}$      (b) $\frac{{t}_{1}+273}{{t}_{1}-{t}_{2}}$

(c) $\frac{{t}_{2}+273}{{t}_{1}-{t}_{2}}$    (d) $\frac{{t}_{1}+{t}_{2}}{{t}_{1}+273}$

(b) For a refrigerator, we know that

$\frac{{Q}_{1}}{W}=\frac{{Q}_{1}}{{Q}_{1}-{Q}_{2}}=\frac{{T}_{1}}{{T}_{1}-{T}_{2}}$

where,

${Q}_{1}$=amount of heat delivered to the room

W = electrical energy consumed

${T}_{1}$= room temperature= ${t}_{1}+273$

${T}_{2}=$temperature of sink=${t}_{2}+273$

$\therefore$   $\frac{{Q}_{1}}{1}=\frac{{t}_{1}+273}{{t}_{1}+273-\left({t}_{2}+273\right)}$

$⇒{Q}_{1}=\frac{{t}_{1}+273}{{t}_{1}-{t}_{2}}$

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