Page 20 - Spotlight A+ Physics Form 4.5

CHAPTER
7 Quantum Physics

Important Learning Standard Page
• Explain the initiation of the quantum theory. 472
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• Describe quantization of energy. 476
7.1 Quantum Theory Of • Explain wave-particle duality. 477
Light
• Explain concept of photon. 478
• Solve problems using photon energy, E = hf and power, P = nhf. 478

• Explain photoelectric effect. 479
7.2 Photoelectric Effect
• Identify four characteristics of photoelectric effect that cannot be
explained using classsical theory. 482

• State minimum energy required for a photoelectron to be emitted
1 483
from a metal surface using Einstein’s equation, hf = W + —mv 2
2 max
• Explain threshold frequency, f and work function, W. 485
0
hc
7.3 Einstein's • Determine work function of metal, W = hf = —– 485
0
Photoelectric Theory λ 0
• Solve problems using Einstein’s equation for photoelectric effect. 486
• Explain production of photoelectric current in a photocell circuit. 488

• Describe applications of photoelectric effect in daily life. 489

• Black body radiation / Sinaran jasad hitam • Continuous energy / Tenaga selanjar
• Ideal absorber / Penyerap unggul • Photoelectric effect / Kesan fotoelektrik
• Radiation intensity / Keamatan sinaran • Threshold frequency / Frekuensi ambang
• Wave-particle duality / Kedualan gelombang-zarah • Work function / Fungsi kerja
• Discrete energy / Tenaga diskrit

Important Formula and Tips

• Einstein’s photoelectric equation, • Photon power, P = nhf
1
hf = W + —mv 2 in which n is the number of photons emitted per
2 max second
h
hc
• Work done, W = hf = –— • de Broglie's wavelength, λ = —
P
0
λ
0
whereby, f is threshold frequency of metal and λ • Momentum of particle, p = ABBBB
2mK
0
0
is the threshold wavelength of metal whereby, K = —mv 2
1
hc
• Photon energy, E = hf = –— 2
λ
470