A charge moving at a relativistic speed has a speed
Correct answer: C. Comparable to the speed of light
- A. Equal to the speed of light
- B. Greater than speed of light
- C. Comparable to the speed of light
- D. None of these
Explanation
When a charge moves at a relativistic speed, it means it is moving at a significant fraction of the speed of light, approaching but not exceeding it. The speed of the charge would be comparable to the speed of light but always less than it.
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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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