221 prompts matching "Efficiency, and why no machine is perfect"
Quiz: Rectilinear propagation and the formation of shadows
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Practice set: Refraction of light and the change of speed between media
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Exam prep: Snell's law and the refractive index
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Physics at work: Reflection and refraction in Nigerian everyday life
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Let me explain: The simple microscope and its magnification
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Worked example: The compound microscope and how it forms an image
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Exam prep: The camera, and how it compares with the eye
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Quiz: Radio waves and microwaves and their uses
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Worked example: X-rays and gamma rays, their uses and their dangers
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Exam prep: Calculating frequency and wavelength from the wave speed
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Physics at work: Mobile telephony, satellites and fibre optics
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Let me explain: The speed of sound in solids, liquids and gases
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Exam prep: The frequency, wavelength and amplitude of a sound wave
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Real-life Nigeria: Resonance and the vibration of air columns
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Physics at work: The range of human hearing, and ultrasound beyond it
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Quiz: Vibration in strings and the factors affecting the frequency
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Let me explain: Vibration in air columns, in open and closed pipes
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Real-life Nigeria: Ultrasound in medicine and in industry
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Physics at work: Sound in Nigerian music, broadcasting and building design
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Quiz: Brownian motion and what it demonstrates
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