🌊 Waves: frequency and wavelength
Unit 3 · Forces, energy & reactions · 9 min
Waves carry energy, not matter. Frequency is vibrations per second (hertz, Hz); wavelength is the distance between two crests. Wave speed = frequency × wavelength. Higher sound frequency means higher pitch.
Words in this lesson
- 频率 (pín lǜ) — frequency
- 波长 (bō cháng) — wavelength
Project: Shake a rope slowly and then quickly; watch how the wavelength changes.
