The breaking of crystals along definite direction is called _____________________?
Correct answer: A. Cleavage
- A. Cleavage
- B. Symmetry
- C. Isotropy
- D. Homogeneity
Explanation
Cleavage is the tendency of a crystal to split along definite planes or directions where bonding is relatively weaker. “Symmetry” is a likely choice because crystals have regular patterns, but symmetry describes their geometric arrangement, not their breaking behaviour.
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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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