Select an alternative from of uncertainly principle from the following_______________?
Correct answer: B. ∆E . ∆t = h
- A. ∆E = h/m∆c(1-cosθ)
- B. ∆E . ∆t = h
- C. mc2 = hv
- D. Any of above
Explanation
The energy-time form of the uncertainty principle is ΔE Δt approximately equal to h/4π, or often written approximately as h in simplified statements. It expresses that a short-lived state has an uncertain energy. Students may choose c because it is Einstein's mass-energy relation, but that equation is not an uncertainty relation.
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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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