1 the mass of a bottom quark is 420gevc2 and was found by, Ask an Expert

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1) The mass of a bottom quark is 4.20Gev/c^2 and was found by colliding a beam of protons with a cloud of stationary protons.

a) What was the energy of the proton beam?

b) How fast were they moving?

(Hint: The problem is relativistic. Use the center of mass frame.) mp=938.2 Mev/c^2

2) During an experiment you determine the cat off wavelength of a cathod ray tube to be Î»0. You repeat the experiment using light with a wavelength of 1/2 Î»0.

What are the stopping voltage(potential) and electron velocity in terms of Î»0 for second experiment?

3) What are the first 4 wavelength of hte following series for the hydrogen atom?

Lyman

Balmer

Paschen

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