I am not a physics student. In one of my courses, some fundamental concepts of Quantum mechanics were needed, so I was going through them when I stumbled upon this. It says $$\text{probability} = \int_a^b\Psi^*\Psi\mathrm{d}x\quad\biggl(= \int_a^b\Psi^2\mathrm{d}x\text{ if }\Psi\text{ is a real...

The dawn of a new year, 2015, now approaches, or has already approached, either way it means that it is now time to reset our Community Promotion Ads! What are Community Promotion Ads? Community Promotion Ads are community-vetted advertisements that will show up on the main site, in the right s...

Questions can be put on hold or closed. What does it mean for a question to be closed or “on hold”? Who can put a question on hold? What are the reasons for putting a question on hold? What if multiple close reasons are used on a question? Is closure the end of the road for a question? When are...

Since it's currently impossible to delete a "vote to close",* when I see a poorly asked question, should I immediately vote to close, or should I comment, and give the OP a chance to improve his question? Waiting increases the chance that I'll forget, and never vote to close, potentially leading...

experiments plate capacitance of the lab in physics

Short answer: No. Long answer: Nooooooooooooooooooooooooooooooooooooooooooooooooooooo. Moral of the story: Gravity and EM are two very different things that look similar to some people because they both fall off like $\frac{1}{r^2}$. Be careful what you trust. When someone makes a claim like th...

The problem is what Konstantin Tsiolkovsky discovered 100 years ago: as speed increases, the mass required (in fuel) increases exponentially. This relation, specifically, is $$ \Delta v=v_e\ln\left(\frac{m_i}{m_f}\right) $$ where $v_e$ is the exhaust velocity, $m_i$ the initial mass and $m_f$ the...

I think the easiest way is to start off with the conservation of momentum in the conservation-law form: $$ \frac{\partial\boldsymbol\pi}{\partial t}=\nabla\cdot\mathbb T=0 $$ where $\boldsymbol\pi=\rho\mathbf u$ and $$\mathbb T=\rho\mathbf u\mathbf u+\left(p+\frac12B^2\right)\mathbb I - \mathbf...

This term looks like Faraday's law that is used in Ideal magnetohydrodynamics (MHD). So yes, it is true. In order to see the mathematical advection, you'll need to apply some vector calculus: $$ \nabla\times\mathbf a\times\mathbf b = \mathbf a\left(\nabla\cdot\mathbf b\right) - \mathbf b\left(\...

The first thing I want to introduce is the standard candle, which is an astronomical object with a very well known luminosity and emission profile. One of the best standard candles we have is the Type 1a Supernova. This type of supernova only occurs in a very specific way such that all type 1a su...

I purchased this line laser recently and I'm running into a bit of an issue. The laser shoots out at a 120 degree angle which is perfect. However, once the laser spreads to about 4.25 inches, I need to redirect the light to move straight again. However, I have never worked with lenses before...