Show that the differential cross section for the photoelectric effect in which an electron in the ground state of hydrogen is ejected when the atom absorbs a photon is given by h ky(e k = 320 mw do [(1/a)+qr where q ki kf. assume the ejected electron is sufficiently energetic that the wave function for the electron can be taken to be the plane wave ekr (rlk) v where p hk, is the momentum of the electron and ak, is the momentum of the incident photon. suggestion: the cross section is the transition rate divided by the incident photon flux, which is equal to c/v in the box normalization used in this chapter.

the answer is c i did the same question so i know that's right!

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

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