What experimental evidence do we have for the direct transformation of energy into matter?
A) an increase in the force upon a body when it is accelerated upward (e.g., in an elevator)
B) the conversion of gamma-ray photons into electrons and antielectrons (i.e., positrons)
C) the blueshift of light because of the motion of its source
D) the relativistic increase in mass of an object when it is moving very rapidly
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