Answered: The kinetic energy of a particles… | bartleby

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(a) The kinetic energy of a particles emitted from the radium element was
measured as 4.8 MeV (million eV). Since the mass of a particle is 6.6×10-27 kg, calculate
the accompanying de Broglie wavelength in picometers (pm). (1 pm = 10-12 m) (b) For
the element lithium, no photoelectrons are formed when irradiated above wavelength of
520 nm. Calculate the kinetic energy in eV of photoelectrons that a monochromatic
beam of 360 nm wavelength can eject from element Li.

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