In a Davisson Germer experiment Helium atoms were used in place of electrons What should be the energy of Helium so that a

Question

In a Davisson Germer experiment Helium atoms were used in place of electrons What should be the energy of Helium so that a strong peak of scattered He appears at an angle of 500 as was the case with electrons having an energy of 54 eV Take mass of He atoms to be 7500 times the mass of electrons A 7 2 meV B 3 6 meV C 405 MeV D 202 5 MeV

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