X rays with a wavelength of 73.0 pm aredirected onto a gold foil and eject tightlybound electrons from atoms of the foil. Theejected electrons then move in circular pathsof radius r in a region of uniform magneticfield with magnitude B. For the fastest ofthe ejected electrons, the product Br is equalto 2.46 x 104 T•m. Find (a) the maximumkinetic energy of those electrons and (b) thework done in removing them from the goldatoms.

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