A helium atom, mass 4u travels with non relativistic speed v normal to the surface of...
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A helium atom, mass 4u travels with non relativistic speed v normal to the surface of a certain material, makes an elastic collision with an (essentially free) surface atom, and leaves in the opposite direction with speed 0.6v. The atom on the surface must be an atom of A. Hydrogen, mass 1u B. Helium, mass qu C. Carbon, mass 12u D. Oxygen, mass 16u E. Silicon, mass 28u A helium atom, mass 4u travels with non relativistic speed v normal to the surface of a certain material, makes an elastic collision with an (essentially free) surface atom, and leaves in the opposite direction with speed 0.6v. The atom on the surface must be an atom of A. Hydrogen, mass 1u B. Helium, mass qu C. Carbon, mass 12u D. Oxygen, mass 16u E. Silicon, mass 28u
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