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n moles of an ideal gas undergo a proces...

n moles of an ideal gas undergo a process in which the temperature changes with volume as `T=kv^(2)`. The work done by the gas as the temperature changes from `T_(0)` to `4T_(0)` is

A

work done by the gas is `3nRT_(0)`

B

heat supplied to the gas is `6nRT_(0)`

C

work done by the gas is `(3)/(2)nRT_(0)`

D

heat supplied to the gas is `(3)/(2)nRT_(0)`

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The correct Answer is:
To solve the problem of finding the work done by an ideal gas as it undergoes a process where the temperature changes with volume according to the equation \( T = kV^2 \), we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Relationship**: We are given that \( T = kV^2 \). This means that the temperature of the gas is proportional to the square of its volume. 2. **Use the Ideal Gas Law**: The ideal gas law is given by: \[ PV = nRT \] Substituting \( T = kV^2 \) into the ideal gas law: \[ PV = nR(kV^2) \] Rearranging gives: \[ P = \frac{nRkV^2}{V} = nRkV \] 3. **Determine the Volumes at Given Temperatures**: - For \( T = T_0 \): \[ T_0 = kV_1^2 \implies V_1^2 = \frac{T_0}{k} \implies V_1 = \sqrt{\frac{T_0}{k}} = V_0 \] - For \( T = 4T_0 \): \[ 4T_0 = kV_2^2 \implies V_2^2 = \frac{4T_0}{k} \implies V_2 = \sqrt{\frac{4T_0}{k}} = 2\sqrt{\frac{T_0}{k}} = 2V_0 \] 4. **Calculate the Work Done**: The work done \( W \) by the gas during this process can be expressed as: \[ W = \int_{V_1}^{V_2} P \, dV \] Substituting \( P = nRkV \): \[ W = \int_{V_0}^{2V_0} nRkV \, dV \] This integral can be computed as follows: \[ W = nRk \int_{V_0}^{2V_0} V \, dV = nRk \left[ \frac{V^2}{2} \right]_{V_0}^{2V_0} \] Evaluating the limits: \[ W = nRk \left( \frac{(2V_0)^2}{2} - \frac{(V_0)^2}{2} \right) = nRk \left( \frac{4V_0^2}{2} - \frac{V_0^2}{2} \right) = nRk \left( \frac{3V_0^2}{2} \right) \] 5. **Substitute \( V_0 \)**: Recall that \( V_0 = \sqrt{\frac{T_0}{k}} \): \[ V_0^2 = \frac{T_0}{k} \] Thus, \[ W = nRk \left( \frac{3}{2} \cdot \frac{T_0}{k} \right) = \frac{3}{2} nRT_0 \] ### Final Answer: The work done by the gas as the temperature changes from \( T_0 \) to \( 4T_0 \) is: \[ W = \frac{3}{2} nRT_0 \]
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