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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 Quiz: Laser Physics, Population Inversion and the Helium-Neon Laser

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1.
A metallic cube of side length 10 cm and density 7800 kg/m3 is completely submerged in water (density 1000 kg/m3). The buoyant force (upthrust) acting on the cube is (g = 10 m/s2):
68 N
78 N
10 N
100 N
2.
Why is the scale of a Hot-Wire Ammeter non-uniformly divided with increasing intervals between marks?
C) Because the expansion coefficient of Platinum-Iridium is nonlinear
D) Due to friction on the rotating pulley axis
A) Due to ambient room temperature fluctuations
B) Because thermal energy generated is proportional to the square of current (\(Q propto I^2\))
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