7.1.1. How many photons per second are emitted by a 10.0-mW CO2 laser that has a wavelength of 10.6 µm? 7.1.2. The photoelectric threshold wavelength of a tungsten surface is 272 nm. Calculate the maximum kinetic energy of the electrons ejected from this tungsten surface by ultraviolet radiation of frequency 2.1· 1015 Hz. Express the answer in electron-volts. 7.1.3. X-rays with the initial wavelength of 36 pm undergo Compton scattering. (a) What is the longest wavelength found in the scattered X-rays? (b) At which scattering angle is this wavelength observed?

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