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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: Blackbody Radiation, Max Planck Hypothesis and the Photon — Picture questions (exam style)

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1.
A sphere of radius 5.00 cm behaves as a black body at 1000 K. Find the total power it radiates (σ = 5.67×10−8 W m−2 K−4).
A sphere of radius 5.00 cm behaves as a black body at 1000 K. Find the total power it radiates (σ = 5.67×10⁻⁸ W m⁻² K⁻⁴).
56700 W
1780 W
445 W
1.78×10−3 W