JEE Mains · Physics · STD 11 - 11. thermodynamics
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Statement I: Change in internal energy of a system containing \(n\) mole of ideal gas can be written as \(\Delta U = n C_v (T_f - T_i) = \dfrac{nR}{\gamma - 1}(T_f - T_i)\), where \(\gamma = \dfrac{C_p}{C_v}\), \(T_i =\) initial temperature, \(T_f =\) final temperature.
Statement II: Relation between degree of freedom \(f\) and \(\gamma (= C_p/C_v)\) is \(\left(\gamma = 1 + \dfrac{2}{f}\right)\)
Choose the correct answer from the options given below
- A Both A and R are true and R is the correct explanation of A
- B Both A and R are true but R is NOT the correct explanation of A
- C A is true but R is false
- D A is false but R is true
Answer & Solution
Correct Answer
(B) Both A and R are true but R is NOT the correct explanation of A
Step-by-step Solution
Detailed explanation
Statement I is true because for an ideal gas, the change in internal energy is given by \(\Delta U = n C_v \Delta T\). Using Mayer's relation \(C_p - C_v = R\) and the ratio of specific heats \(\gamma = \dfrac{C_p}{C_v}\), we can write \(C_v = \dfrac{R}{\gamma - 1}\).…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Young’s moduli of two wires \(A\) and \(B\) are in the ratio \(7 : 4\). Wire \(A\) is \(2\, m\) long and has radius \(R\). Wire \(A\) is \(2\, m\) long and has radius \(R\). Wire \(B\) is \(1.5\, m\) long and has radius \(2\, mm\). If the two wires stretch by the same length for a given load, then the value of \(R\) is close to ......... \(mm\)JEE Mains 2019 Medium
- A car covers \(A B\) distance with first one-third at velocity \(v _{1} ms ^{-1}\), second one-third at \(v _{2} ms ^{-1}\) and last one-third at \(v _{3} ms ^{-1}\). If \(v _{3}=3 v _{1}, v _{2}=2 v _{1}\) and \(v _{1}=11\,ms ^{-1}\) then the average velocity of the car is________ \(ms ^{-1} .\)
JEE Mains 2022 Medium - The momentum of a body is increased by \(50 \%\). The percentage increase in the kinetic energy of the body is \(...........\,\%\)JEE Mains 2023 Medium
- In the given circuit the current through Zener Diode is close to.......\(mA\)
JEE Mains 2019 Medium - The binding energy for the following nuclear reactions are expressed in MeV .
\({ }_2 He ^3+{ }_0 n ^1 \rightarrow{ }_2 He ^4+20 MeV\)
\({ }_2 He ^4+{ }_0 n ^1 \rightarrow{ }_2 He ^5-0.9 MeV\)
If \(X _3, X _4, X _5\) denote the stability of \({ }_2 He ^3,{ }_2 He ^4\) and \({ }_2 He ^5\), respectively, then the correct order is :JEE Mains 2026 Medium - A small square loop of wire of side \(l\) is placed inside a large square loop of wire \(L(L \gg l)\). Both loops are coplanar and their centres coincide at point \(O\) as shown in figure. The mutual inductance of the system is.
JEE Mains 2022 Hard
More PYQs from JEE Mains
- For \(0 \le x \le \frac{\pi }{2}\), the value of \(\int\limits_0^{{{\sin }^2}\,x} {{{\sin }^{ - 1}}\,\left( {\sqrt t } \right)} dt + \int\limits_0^{{{\cos }^2}\,x} {{{\cos }^{ - 1}}\,\left( {\sqrt t } \right)}\, dt\) equalsJEE Mains 2013 Hard
- Suppose \(a_1, a_2, 2, a_3, a_4\) be in an arithmeticogeometric progression. If the common ratio of the corresponding geometric progression is \(2\) and the sum of all \(5\) terms of the arithmetico-geometric progression is \(\frac{49}{2}\), then \(a_4\) is equal to \(...........\).JEE Mains 2023 Hard
- Let \(\vec{u}=\hat{i}-\hat{j}-2 \hat{k}, \vec{v}=2 \hat{i}+\hat{j}-\hat{k}, \vec{v} \cdot \vec{w}=2\) and \(\vec{v} \times \vec{w}=\vec{u}+\lambda \vec{v}\), then \(\vec{u} \cdot \vec{w}\) is equal toJEE Mains 2023 Medium
- In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are \(100\) divisions in circular scale and pitch of screw gauge is \(0.1\) mm. When diameter of a sphere is measured, the reading of main scale is \(5\) mm and \(50^{\text{th}}\) division of circular scale coincides with the reference line of main scale. The diameter of sphere is _______ mm.JEE Mains 2026 Medium
- At a given instant, say \(t = 0,\) two radioactive substances \(A\) and \(B\) have equal activates. The ratio \(\frac{{{R_B}}}{{{R_A}}}\) of their activities. The ratio \(\frac{{{R_B}}}{{{R_A}}}\) of their activates after time \(t\) itself decays with time \(t\) as \(e^{-3t}.\) If the half-life of \(A\) is \(ln2,\) the half-life of \(B\) isJEE Mains 2019 Hard
- Let \(A\) and \(B\) be two independent events such that \(\mathrm{P}(\mathrm{A})=\frac{1}{3}\) and \(\mathrm{P}(\mathrm{B})=\frac{1}{6} .\) Then, which of the following is TRUE?JEE Mains 2020 Hard