Explaining the Photoelectric Effect
Quantum theory and the discrete transfer of light energy
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II. Explaining photoelectric effect using quantum theory
A. Quantum Theory
1) electrons can only absorb or emit energy in discrete amounts called quanta (packets) 2) Energy of each quanta (photon) is proportional to frequency of radiation
Energy of a Quanta
June 2004 #40
Since: c = fλ c = 3 x 108 m/s
And f = c/λ
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. In quantum theory, electrons absorb or emit energy in discrete packets called…
2. The energy of a photon is…
3. Find the energy of a photon with frequency 1.0 × 10¹⁵ Hz. (h = 6.63 × 10⁻³⁴ J·s)
4. If a photon's frequency is doubled, its energy…
5. Light A has a longer wavelength than light B. Which photon has more energy?