What is the recoil velocity of an electron (in m/s), if a 44 keV photon strikes the electron initially at rest and the photon is scattered through an angle of 86°? Ответ:

You set up a photoelectric experiment with an unknown metal to eject electrons. You use light of wavelength λ = 670 nm, which just BARELY ejects electrons from the metal. Planck□s constant is either h = 6.63 x 10-34 J-s or h = 4.14 x 10-15 ev.s. a) What is the binding energy of the unknown metal in eV? ev b) You change the light source to one with a wavelength of λ = 310 nm. Using the binding energy you found in the previous step, find the maximum kinetic energy of an electron that is ejected from the metal in Joules. J c) What is the stopping voltage for an electron with the kinetic energy you just found? V

X-rays with an energy of 400 keV undergo Compton scattering from a target. The scattered rays are deflected at an angle of 32.0° relative to the direction of the incident rays. What is the energy of the scattered x-rays?   a. 3.58E+2 keV   b. 4.00E+2 keV   c. 3.37E+3 keV   d. 3.23E+2 keV

For light with a wavelength of 350 nm and with an intensity of /= 10-8 W/m², what is the number of photons/(m²s) in the light beam?