The mass energy relation E equals mc squared implies that
Correct answer: A. mass and energy are different names for one physical quantity that can be converted between forms
- A. mass and energy are different names for one physical quantity that can be converted between forms
- B. mass can never be converted to energy
- C. energy has no mass
- D. c is a variable
Explanation
Because c squared is so large, a tiny loss of mass releases an enormous quantity of energy, which is exactly what happens in nuclear fission and fusion. The mass defect of a nucleus, converted by this relation, gives its binding energy. Chemical reactions release energy too, but the accompanying mass change is far too small to measure.
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About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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