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Physics : Recent Questions and Answers (Page 254)

Find answers to your questions about Physics or help others by answering their Physics questions.

Suppose for all value of $r$ expression for Effective Potential Energy $U_{eff}$ is zero, does that mean $F(r)$ is zero?

Suppose for all value of $textbf{r}$ expression for Effective Potential Energy ($U_{eff}$) is zero, does that mean $F(textbf{r})$ is zero?...

Asked on 06/17/2021 by DIVYANSH_269

1 answer

Why does the 3-point function of a real scalar field vanish?

$$langle0lvert Thatphi(x_1)hatphi(x_2)hatphi(x_3)rvert0rangle$$ I'm looking for an intuition to it, if not an actual interpretation. Otherwise, I know how to get the result 0 using Wick's theorem. The same question...

Asked on 06/17/2021

2 answer

Why atmospheric pressure does not influence vapor pressure of water but only temperature does?

We know vapour pressure is dependent on temperature. But why it is not dependent on atmospheric pressure or pressure applied on the gas surrounding vapour-water equilibrium? Pressure does influence vaporization/evaporation...

Asked on 06/17/2021

2 answer

Quantum Mechanics - Derivation of the fact that determinate states are eigenvectors of the $hat{Q}$ operator

In the Intro to Quantum Mechanics textbook by Griffiths on page 105 equation [3.116], I'm confused about 3 things. What is...

Asked on 06/17/2021 by dnie

1 answer

Escape velocity questions

This topic really screwed with my head in school and my teacher could never answer my questions so I thought I would ask here. I will break it down with...

Asked on 06/17/2021 by Andrew Foot

1 answer

Power produced by steam turbine

Why for the same turbine exit condition, if the pressure and temperature of the air vapor entering the turbine are increased, the power produced by the turbine is greater?...

Asked on 06/17/2021

2 answer

Second-order perturbation and photon creation

During the calculation to compute the shift of the energy of the hydrogen atom due to the photons by perturbation theory Schwartz states thatAt second order in perturbation theory, only...

Asked on 06/17/2021

1 answer

Why can one neglect terms quadratic in derivatives of $h_{munu}$ in linearised gravity?

In the linear approximation, terms quadratic in the Christoffel symbols are all neglected in the Riemann Tensor. However, these are not quadratic in the $h_{munu}$ but quadratic in the...

Asked on 06/17/2021

2 answer

Is Landau free energy really the free energy

I recall reading in Negele&Orland's book that Landau free energy function is not really the free energy that one obtains from the partition function $$F = -frac{1}{beta}log Z.$$ Indeed,...

Asked on 06/17/2021 by Roger Vadim

0 answer

Having difficulties deriving the formula for the force acting upon a dam with height $H$ and width $L$

I was recently fiddling around with the derivation of the formula for the force acting upon a dam with height $H$ and width $L$, which in my textbook...

Asked on 06/17/2021

3 answer

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