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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.
Which statement about the laser shown is NOT correct?
Which statement about the laser shown is NOT correct?
in He–Ne energy passes from helium to neon by collisions
in He–Ne the lasing transition is in helium
the front cavity mirror is partially reflecting
a metastable level lengthens the excited lifetime
2.
Which statement about the laser shown is NOT correct?
Which statement about the laser shown is NOT correct?
stimulated emission gives a photon with the same phase, frequency and direction
the front cavity mirror is partially reflecting
in He–Ne the lasing transition is in helium
population inversion is needed for amplification
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