NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXI13:KINETIC THEORY
360385
Using equipartition of energy, the specific heat \((in{\text{ }}J\,k{g^{ - 1}} {K^{ - 1}})\) of aluminium at room temperature can be estimated to be (atomic weight of aluminium \(=27\) )
1 410
2 25
3 1850
4 925
Explanation:
According to Dulong-Petit law many solids at room temperature \(C_{V}=3 R\). For solids when heat is given their volume approximately remain constant. \(\Delta U=\Delta Q\) For on mole Using equipartition of energy, we have \(3RT = MCT\) \(C = \frac{{3R}}{M} = \frac{{3 \times 8.314}}{{27 \times {{10}^{ - 3}}}}\) \(\therefore C = 925\,\,J/kgK\)
JEE - 2015
PHXI13:KINETIC THEORY
360386
Assertion : Heat capacity of a solid per mole is \(3 R\). Reason : In solids the average K.E of an atom is \(3 k_{B} T\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
In a cubic lattice the atoms can oscillate in three dimensions. So option (1) is correct.
360385
Using equipartition of energy, the specific heat \((in{\text{ }}J\,k{g^{ - 1}} {K^{ - 1}})\) of aluminium at room temperature can be estimated to be (atomic weight of aluminium \(=27\) )
1 410
2 25
3 1850
4 925
Explanation:
According to Dulong-Petit law many solids at room temperature \(C_{V}=3 R\). For solids when heat is given their volume approximately remain constant. \(\Delta U=\Delta Q\) For on mole Using equipartition of energy, we have \(3RT = MCT\) \(C = \frac{{3R}}{M} = \frac{{3 \times 8.314}}{{27 \times {{10}^{ - 3}}}}\) \(\therefore C = 925\,\,J/kgK\)
JEE - 2015
PHXI13:KINETIC THEORY
360386
Assertion : Heat capacity of a solid per mole is \(3 R\). Reason : In solids the average K.E of an atom is \(3 k_{B} T\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
In a cubic lattice the atoms can oscillate in three dimensions. So option (1) is correct.