Waves
7th Grade Science · 8 lessons
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Lessons
- 1Transverse and Longitudinal WavesWaves transfer energy without transferring matter. Transverse waves (like light) vibrate perpendicular to the direction of travel. Longitudinal waves (like sound) vibrate parallel.Lesson
- 2The Electromagnetic SpectrumThe electromagnetic spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, ordered by increasing frequency and energy.Lesson
- 3Properties of Sound WavesSound waves have properties including amplitude (loudness), frequency (pitch), and wavelength. Higher frequency means higher pitch. Greater amplitude means louder sound.Lesson
- 4Interpreting RiskA risk that doubles sounds alarming until you know the starting figure: doubling a one-in-a-million chance is still one in five hundred thousand. Relative risk without absolute risk is one of the commonest ways statistics mislead.Lesson
- 5Wave Speed, Frequency and WavelengthEvery wave obeys v = fλ. In one medium the speed is fixed, so raising the frequency shortens the wavelength by exactly the same factor. That single equation covers sound, light, water ripples and seismic waves alike.Experiment
- 6Transverse and Longitudinal Waves ComparedIn a transverse wave the particles move at right angles to the travel direction; in a longitudinal wave they move along it, making compressions and rarefactions. Light is transverse, sound is longitudinal, and only the first can be polarised.Experiment
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