501 prompts matching "The decay constant and the activity of a source"
Quiz: Stimulated emission and population inversion
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Let me explain: Coherence, monochromaticity and collimation
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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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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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Physics at work: Engineering calculation and quality control
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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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Worked example: Calculating the flux density at a point near a long straight wire
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Let me explain: The force on a moving charge in a magnetic field
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Worked example: Calculating the force on a conductor placed at an angle to a field
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Let me explain: Why a.c. is described by an r.m.s. rather than an average value
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Let me explain: Why a geostationary orbit sits above the equator
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Let me explain: How the time base produces a trace
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Real-life Nigeria: The CRO in a Nigerian electronics workshop
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Let me explain: The transistor as a current amplifier
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Worked example: The kinetic energy gained across a stated accelerating voltage
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Real-life Nigeria: The cathode ray tube in older television sets
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