📚 The Electromagnetic Spectrum: From 630 nm Red Light to Everyday Applications | 电磁波谱：从630 nm红光到日常应用
Electromagnetic waves are one of the most important ideas in IGCSE Science. They transfer energy from one place to another without needing a medium, and they surround us in many forms: radio signals, microwaves, visible light and X-rays. In Edexcel IGCSE Science, you need to know the order of the electromagnetic spectrum, the wave equation, and the uses and dangers of each type. A familiar example is red light with a wavelength of 630 nm, which can help you understand how to calculate frequency and energy.
电磁波是 IGCSE 科学中最重要的概念之一。它们可以在没有介质的情况下将能量从一个地方传递到另一个地方，并以多种形式存在于我们周围：无线电信号、微波、可见光和 X 射线。在 Edexcel IGCSE 科学中，你需要掌握电磁波谱的顺序、波速方程，以及每种电磁波的应用与危害。一个熟悉的例子是波长为 630 nm 的红光，它可以帮助你理解如何计算频率和能量。
1. What Are Electromagnetic Waves? | 什么是电磁波？
An electromagnetic wave is a transverse wave made up of oscillating electric and magnetic fields. The electric and magnetic field vibrations are at right angles to each other, and also at right angles to the direction of energy transfer. This means electromagnetic waves can travel through a vacuum, because they do not need particles to vibrate.
电磁波是一种由振动的电场和磁场组成的横波。电场和磁场的振动方向相互垂直，并且都与能量传播方向垂直。这意味着电磁波可以在真空中传播，因为它们不需要粒子来振动。
me speed in a vacuum. That speed is about 3 × 10⁸ metres per second, usually written as c.
对于 Edexcel IGCSE 科学，请记住这些关键事实：电磁波是横波，它们传递能量，并且它们在真空中的传播速度相同。这个速度约为 3 × 10⁸ 米每秒，通常用 c 表示。
2. The Electromagnetic Spectrum | 电磁波谱
The electromagnetic spectrum is the full range of electromagnetic waves, arranged in order of decreasing wavelength and increasing frequency. From longest wavelength to shortest wavelength, the order is: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays.
电磁波谱是电磁波的全范围，按波长递减、频率递增的顺序排列。从最长波长到最短波长，顺序为：无线电波、微波、红外线、可见光、紫外线、X 射线和 γ 射线。
| Type | 类型 | Wavelength range | 波长范围 | Frequency range | 频率范围 |
| Radio | 无线电波 | > 0.1 m | < 3 × 10⁹ Hz |
| Microwave | 微波 | 1 mm – 0.1 m | 3 × 10⁹ – 3 × 10¹¹ Hz |
| Infrared | 红外线 | 700 nm – 1 mm | 3 × 10¹¹ – 4.3 × 10¹⁴ Hz |
| Visible light | 可见光 | 400 – 700
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