Photon energies of laser light

What are the photon energies of laser light from : (a) a typical carbon dioxide laser, (b) a typical Helium-Neon laser, and (c) an Argon Fluoride laser ?

Properties of laser beam

What properties of a laser beam are used in: (a)holography- (b)punching holes in baby bottle (c)monitoring location of the crater of a dormant volcano by interferometry- (d)laying straight railroad tracks-

What minimum barrier thickness is there no reflection?

I have a test coming up and I was told I need to know how to work out a problem like this: Suppose electrons with E= 13.0 eV approach a potential barrier of height 6.0 eV. For what minimum barrier thickness is there no reflection? For what minimum barrier thickness is the reflection a maximum?

To determine the width of the potential barrier given the transmission probability of the electron through it.

An electron with E= 1.2 eV has a probability of 10^-4 for tunneling through a potential barrier with a height of 2.4 eV. What is the width of the potential barrier?

Probability of an electron being inside the proton.

Calculate the probability of an electron in the ground state of the hydrogen atom being inside the region of the proton. (For purposes of calculation, use a proton radius r = 0.990 10-15 m.)