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Physics

Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1: Laser Physics, Population Inversion and the Helium-Neon Laser — Picture questions (exam style)

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1.
Laser 1: 5 mW, 1064 nm, beam 2 mm; laser 2: 5 mW, 405 nm, beam 2 mm. (N = photons per s, I = beam intensity.) Which option is correct?
Laser 1: 5 mW, 1064 nm, beam 2 mm; laser 2: 5 mW, 405 nm, beam 2 mm. (N = photons per s, I = beam intensity.) Which option is correct?
N₁ : N₂ = 0.381, I₁ : I₂ = 2
N₁ : N₂ = 0.381, I₁ : I₂ = 1
N₁ : N₂ = 1, I₁ : I₂ = 1
N₁ : N₂ = 2.63, I₁ : I₂ = 1