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1)A magnesium surface has a work function of 2.65 eV. Electromagnetic waves with a wavelength of...

1)A magnesium surface has a work function of 2.65 eV. Electromagnetic waves with a wavelength of 280 nm strike the surface and eject electrons. Find the maximum kinetic energy of the ejected electrons. Express your answer in electron volts.

Ans in  eV

2)What is the energy of each of the two photons produced in an electron-positron annihilation?
Use the following Joules-to-electron-Volts conversion 1eV = 1.602 × 10-19 J.
The rest mass of an electron is 9.11×10^-31 kg.

Ans in MeV

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