Answer to Question #81584 in Physics for cc7

Question

1.Protons in an accelerator at the Fermi National Laboratory near Chicago are accelerated to a total energy that is 400 times their rest energy.

(a) What is the speed of these protons? (Round your answers to six decimal places.)
E = 400 × mc2 = γmc2

(b) What is their kinetic energy?
( m p = 938.3 MeV/c 2 )

2. When light of wavelength210nm falls on a gold surface, electrons having a maximum kinetic energy of 0.81 eV are emitted. Find values for the following.

(a)the work function of gold

(b)the cutoff wavelength