501 prompts matching "Let me explain: Reading a velocity-time graph"
Quiz: Total internal reflection as the basis of the fibre
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Worked example: The critical angle from stated refractive indices
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WAEC prep: The advantages of fibre over copper cable
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Spot my mistake: Assuming light bends round the fibre rather than reflecting
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Real-life Nigeria: Fibre backbones carrying Nigerian internet traffic
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Physics at work: Telecommunications
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Quiz: Stimulated emission and population inversion
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Worked example: Photon energy of a laser of stated wavelength
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Practice set: Problems on laser output and photon count
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WAEC prep: The uses and hazards of lasers
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Spot my mistake: Treating laser light as simply very bright light
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Real-life Nigeria: Lasers in surgery, printing and barcode scanning
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Physics at work: Laser and photonics work
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Real-life Nigeria: Unit checking before trusting a calculation
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Physics at work: Engineering calculation and quality control
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Quiz: Newton's third law applied to rocket propulsion
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Worked example: Thrust from a stated exhaust speed and mass flow rate
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Spot my mistake: The claim that a rocket pushes against the air
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Real-life Nigeria: Nigeria's satellite launches and space agency work
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Physics at work: Aerospace engineering
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