Barrier Definition and 260 Threads

I have some questions about barrier tunneling in a scanning tunneling microscope. From what I know, the microscope consists of a one atom tip very close to the surface of the metal being examined. A potential difference is applied between the tip and the metal and some of the electrons manage...

This is my second post after that of "Shuttle Main Engines" in which I use again the question: what is happening here? First of all, open the .jpg file below. It shows a F-4 Phantom breaking the sound of barrier. I'm interested on what happens in the condensated flow. First of all, why is...

In quantum mechanics particles which do not classically have enough energy to pass through a barrier do so. But surely there is no mystery here if the energy of the barrier is not as great as it is thought to be. Charged particles from space could be penetrating the barrier and cancelling...

I have a question to do but I am a bit confused about one thing. It invloves protons penetrating a barrier. The protons ae quoted to have a KE in the units of eV (which i will have to convert to joules in order to work in SI units). However the barriers height is given in volts. I assumed...

Friend asked me this question ,and I wasn't about answer. Not my area of expertise). I guess rocket gets easier trough the sound barrier than millitary jet aircraft due to somewhat "less" problematic geometric shape. I mean there is no such problems with wings and drag like in aircrafts?

If a bullet exits a barrel at 3000fps. Does the breaking of the sound barrier by the bullet influence the BOOM that you hear. Thank you.

(modified this to reflect a better understanding) Stationary solutions to the wave equation mean that if I calculate <x> I will get a value independent of time. For a potential defined as V(x) =0 from x = 0 to a and infinite outside that range of x, the lowest energy solution is Psi(x,0) = A...

Its something that I should be able to figure out easily but my brain is refusing to work this term. So any help will be appreciated. In a scattering experiment, gold nuclei (Au Z=79 A=197) are bombarded by alpha particles (He Z=2 A=4) If the Kinetic Energy of the apha particles is...

A new claim has appeared in physics. It is claimed that there is a largest possible force, namely c^4/4G or 3 x 10^43 Newton. (The claim is made in the paper http://xxx.lanl.gov/abs/physics/0309118 ) All my friends and acquantances have first said "wrong!" but then failed to produce a...

[SOLVED] Underwater barrier [?] Since I've been lookin a the concept and knowledge to what happens when the sound barrier gets broken and how it happens, it got me thinking about if the same thing can happen in water. i.e. If an object was to move faster than the water molecues could move what...