The symbol of the prefix used for Mega is_______?
Correct answer: C. M
- A. G
- B. h
- C. M
- D. E
Explanation
The prefix mega represents 10^6 and its SI symbol is capital M. The likely mistake is choosing G, which is the symbol for giga and represents 10^9.
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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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