Home
Class 11
PHYSICS
find the minimum attainable pressure of ...

find the minimum attainable pressure of an ideal gs in the process `T = t_0 + prop V^2`, where `T_(0)n` and `alpha` are positive constants and (V) is the volume of one mole of gas.

Text Solution

AI Generated Solution

The correct Answer is:
To find the minimum attainable pressure of an ideal gas in the process defined by the equation \( T = t_0 + \alpha V^2 \), where \( t_0 \) and \( \alpha \) are positive constants and \( V \) is the volume of one mole of gas, we can follow these steps: ### Step 1: Relate Volume to Pressure and Temperature For one mole of an ideal gas, we use the ideal gas equation: \[ PV = RT \] From this, we can express the volume \( V \) in terms of pressure \( P \) and temperature \( T \): \[ V = \frac{RT}{P} \] ### Step 2: Substitute Volume into the Given Temperature Equation Now, substitute \( V \) into the temperature equation: \[ T = t_0 + \alpha V^2 \] Substituting for \( V \): \[ T = t_0 + \alpha \left(\frac{RT}{P}\right)^2 \] This simplifies to: \[ T = t_0 + \alpha \frac{R^2 T^2}{P^2} \] ### Step 3: Rearranging the Equation Rearranging the equation gives us: \[ TP^2 = t_0 P^2 + \alpha R^2 T^2 \] This can be rearranged to isolate \( P \): \[ P^2 (T - t_0) = \alpha R^2 T^2 \] Thus, we can express \( P \) as: \[ P = \sqrt{\frac{\alpha R^2 T^2}{T - t_0}} \] ### Step 4: Differentiate to Find Minimum Pressure To find the minimum pressure, we need to differentiate \( P \) with respect to \( T \) and set the derivative equal to zero: \[ \frac{dP}{dT} = 0 \] Using the quotient and chain rule, we differentiate: \[ P = \sqrt{\frac{\alpha R^2 T^2}{T - t_0}} \] Let \( u = \alpha R^2 T^2 \) and \( v = T - t_0 \), then: \[ \frac{dP}{dT} = \frac{1}{2} \left(\frac{u}{v}\right)^{-1/2} \left(\frac{v \frac{du}{dT} - u \frac{dv}{dT}}{v^2}\right) \] Where: \[ \frac{du}{dT} = 2\alpha R^2 T \] \[ \frac{dv}{dT} = 1 \] Setting the derivative to zero gives: \[ v(2\alpha R^2 T) - u = 0 \] Substituting back gives: \[ (T - t_0)(2\alpha R^2 T) - \alpha R^2 T^2 = 0 \] ### Step 5: Solve for Temperature \( T \) This simplifies to: \[ 2T - 2t_0 = T \implies T = 2t_0 \] ### Step 6: Substitute Back to Find Minimum Pressure Now substitute \( T = 2t_0 \) back into the pressure equation: \[ P = \sqrt{\frac{\alpha R^2 (2t_0)^2}{2t_0 - t_0}} = \sqrt{\frac{4\alpha R^2 t_0^2}{t_0}} = \sqrt{4\alpha R^2 t_0} = 2R\sqrt{\alpha t_0} \] ### Final Answer Thus, the minimum attainable pressure of the ideal gas is: \[ P_{\text{min}} = 2R\sqrt{\alpha t_0} \] ---

To find the minimum attainable pressure of an ideal gas in the process defined by the equation \( T = t_0 + \alpha V^2 \), where \( t_0 \) and \( \alpha \) are positive constants and \( V \) is the volume of one mole of gas, we can follow these steps: ### Step 1: Relate Volume to Pressure and Temperature For one mole of an ideal gas, we use the ideal gas equation: \[ PV = RT \] From this, we can express the volume \( V \) in terms of pressure \( P \) and temperature \( T \): ...
Promotional Banner

Topper's Solved these Questions

  • THERMOMETRY,THERMAL EXPANSION & KINETIC THEORY OF GASES

    DC PANDEY ENGLISH|Exercise Level 2 More Than One Correct|7 Videos
  • THERMOMETRY THERMAL EXPANSION AND KINETIC THEORY OF GASES

    DC PANDEY ENGLISH|Exercise Medical entrance gallary|30 Videos
  • UNIT AND DIMENSIONS

    DC PANDEY ENGLISH|Exercise Assertion And Reason|2 Videos