The relativistic energy E is equivalent to relativistic mass given by_______________?
Correct answer: B. E/c2
- A. Ec2
- B. E/c2
- C. E/c
- D. c2/E
Explanation
From E = mc2, dividing both sides by c2 gives m = E/c2, so relativistic mass is equivalent to E/c2. The quantity Ec2 has the wrong relationship and dimensions because it multiplies energy by speed squared instead of dividing by it. Students may choose a by rearranging the equation incorrectly.
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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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