Home
Class 12
PHYSICS
P = (nx^(y)T)/(V(0))e^(-(Mgh)/(nxT)), wh...

`P = (nx^(y)T)/(V_(0))e^(-(Mgh)/(nxT))`, where n is number of moles, P is represents acceleration due to gravity and h is height. Find dimension of x and value of y.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to find the dimensions of \( x \) and the value of \( y \) in the equation: \[ P = \frac{n x^y T}{V_0} e^{-\frac{Mgh}{nxT}} \] where: - \( n \) is the number of moles, - \( P \) represents acceleration due to gravity, - \( h \) is height, - \( M \) is mass, - \( g \) is acceleration due to gravity, - \( T \) is temperature, - \( V_0 \) is volume. ### Step 1: Analyze the Exponential Term The term \( e^{-\frac{Mgh}{nxT}} \) must be dimensionless. This means that the dimensions of \( Mgh \) must equal the dimensions of \( nxT \). ### Step 2: Write Down the Dimensions 1. **Dimensions of \( Mgh \)**: - \( M \) (mass) has dimensions \( [M] \). - \( g \) (acceleration due to gravity) has dimensions \( [L][T^{-2}] \). - \( h \) (height) has dimensions \( [L] \). Therefore, the dimensions of \( Mgh \) are: \[ [Mgh] = [M][L][T^{-2}][L] = [M][L^2][T^{-2}] \] 2. **Dimensions of \( nxT \)**: - \( n \) (number of moles) has dimensions \( [\mu] \). - \( x \) has unknown dimensions \( [x] \). - \( T \) (temperature) has dimensions \( [K] \). Therefore, the dimensions of \( nxT \) are: \[ [nxT] = [\mu][x][K] \] ### Step 3: Set the Dimensions Equal Since \( Mgh \) and \( nxT \) must have the same dimensions: \[ [M][L^2][T^{-2}] = [\mu][x][K] \] ### Step 4: Solve for the Dimensions of \( x \) Rearranging gives: \[ [x] = \frac{[M][L^2][T^{-2}]}{[\mu][K]} \] Thus, the dimensions of \( x \) are: \[ [x] = [M^1 L^2 T^{-2} \mu^{-1} K^{-1}] \] ### Step 5: Determine the Value of \( y \) Next, we need to find the value of \( y \). From the equation, we know that \( P \) represents pressure, which has dimensions: \[ [P] = [M][L^{-1}][T^{-2}] \] Now, we can express \( P \) in terms of \( n, x, T, \) and \( V_0 \): \[ [P] = \frac{[\mu][x^y][K]}{[L^3]} \] Rearranging gives: \[ [P][L^3] = [\mu][x^y][K] \] Substituting the dimensions: \[ [M][L^{-1}][T^{-2}][L^3] = [\mu][x^y][K] \] This simplifies to: \[ [M][L^{2}][T^{-2}] = [\mu][x^y][K] \] ### Step 6: Substitute for \( x \) Substituting \( [x] \) into the equation: \[ [M][L^{2}][T^{-2}] = [\mu] \left(\frac{[M][L^2][T^{-2}]}{[\mu][K]}\right)^y [K] \] ### Step 7: Solve for \( y \) After simplification, we find that \( y = 1 \) since the dimensions must balance out. ### Conclusion Thus, we have: - The dimensions of \( x \) are \( [M^1 L^2 T^{-2} \mu^{-1} K^{-1}] \). - The value of \( y \) is \( 1 \).
Promotional Banner

Topper's Solved these Questions

  • UNITS AND MEASUREMENTS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION J (Aakash Challengers )|8 Videos
  • UNITS AND MEASUREMENTS

    AAKASH INSTITUTE ENGLISH|Exercise EXERCISE|20 Videos
  • UNITS AND MEASUREMENTS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION H (Multiple True-False)|6 Videos
  • THERMODYNAMICS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT (SECTION -D) (Assertion - Reason Type Questions)|10 Videos
  • WAVE OPTICS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-J (Aakash Challengers question))|1 Videos

Similar Questions

Explore conceptually related problems

The velocity of a freely falling body changes as g^ph^q where g is acceleration due to gravity and h is the height. The values of p and q are

Let us consider an equaiton (1)/(2)mv^2 = mgh, Where m is the mass of the body, upsilon its velocity, g is acceleration due to gravity and h is the height. Cheak whether this equation is dimensionally correct.

Acceleration due to gravity as same at height h from surface and at depth d from surface, then find value of d

A freely body acquires a velocity of g^(x)h^(y) after falling through a height h. Using dimensions find the values fo x and y.

The Bernoulli's equation is given by P+1/2 rho v^(2)+h rho g=k . Where P= pressure, rho = density, v= speed, h=height of the liquid column, g= acceleration due to gravity and k is constant. The dimensional formula for k is same as that for:

In the equation ((1)/(pbeta))=(y)/(k_(B)T) , where p is the pressure, y is the distance, k_(B) is Boltzmann constant and T is the tempreture. Dimensions of beta are

An object lauched upwards at an angle has parabolic motion. The height h, of a projectile at time t is given by the equation h =1/2 at ^(2) + v _(y)t + h _(0), where a is the acceleration due to gravity, v _(v) is the vertical component of the velocity, and h _(0) is the initial height. Which of the following equations correctly represents the object's acceleration due to gravity in terms of the other variables ?

If the equation of state of a gas is expressed as (P + a/(V^2)) (V - b) = RT where P is the pressure, V is the volume and T the absolute temperature and a, b , R are constants, then find the dimensions of 'a' and 'b' ?

In the formula , p = (nRT)/(V-b) e ^(a/(RTV)) find the dimensions of a and b, where p = pressure , n= number of moles , T = temperture , V = volume and R = universal gas constant .

A storage tower supplies water, as shown in the figure. If P_(0) is the atmospheric pressure h = height of water level, g = acceleration due to gravity, rho= density and v = velocity of flow in the horizontal pipe at B, then the pressure at B is -

AAKASH INSTITUTE ENGLISH-UNITS AND MEASUREMENTS-ASSIGNMENT SECTION I (Subjective)
  1. Write down the number of significant figures in the following . (A)8...

    Text Solution

    |

  2. Round off to four significant figures (A) 49.687 ,(B) 2.0095

    Text Solution

    |

  3. The dimensions of a/b in the equation P=(a-t^(2))/(bx) where P is pre...

    Text Solution

    |

  4. A body of mass m is moving in a circle of radius angular velocity ome...

    Text Solution

    |

  5. Each side of a cube is measured to be 7.203 m. what are the total surf...

    Text Solution

    |

  6. The temperature of two bodies measured by a thermomenter are t(1)=20^(...

    Text Solution

    |

  7. In an experiment the refractive index of glass was observed to be 1.45...

    Text Solution

    |

  8. Find density when a mass of 9.23 kg occupies a volume of 1.1m^3. Take ...

    Text Solution

    |

  9. Solve with due regards to significant figures 4.0 xx (10^-4) - 2.5 x...

    Text Solution

    |

  10. Find the dimensions of a/b in the relation F=a sqrt(x)+"bt"^(2), where...

    Text Solution

    |

  11. Time period of an oscillating drop of radius r, density rho and surfac...

    Text Solution

    |

  12. A physical quantity y is given by y=(P^2Q^(3//2))/(R^4S^(1//2)) The ...

    Text Solution

    |

  13. Calculate focal length of a spherical mirror from the following abserv...

    Text Solution

    |

  14. The velocity of water waves may depend on their wavelength lamda, the ...

    Text Solution

    |

  15. In an experiment of simple pendulum , the time period measured was 50 ...

    Text Solution

    |

  16. if power P and linear mass density are related as P=alpha/(beta^2+lamb...

    Text Solution

    |

  17. The kinetic energy of a particle moving along x-axis varies with the d...

    Text Solution

    |

  18. P = (nx^(y)T)/(V(0))e^(-(Mgh)/(nxT)), where n is number of moles, P is...

    Text Solution

    |