Matter itself has energy called ________?
Correct answer: B. Rest energy
- A. Potential energy
- B. Rest energy
- C. Chemical energy
- D. Nuclear energy
Explanation
Matter has rest energy because a body of mass m possesses energy E = mc² even when it is not moving. Chemical and nuclear energies are stored forms of energy within matter, but they are not the general energy meant by the question. Students may choose nuclear energy by confusing the energy equivalent of mass with energy released in nuclear reactions.
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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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