In simple cube one atom or molecule lies at its______________________?
Correct answer: C. Eight corners
- A. Force corners
- B. Nine corners
- C. Eight corners
- D. Six corners
Explanation
A simple cubic unit cell has atoms at all eight corners, with each corner atom shared among eight neighbouring cells. The common mistake is choosing six, by confusing the number of faces with the number of corners.
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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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