簡單學習 What Is Light？什麽是光？
Today, we are talking about light.
今天，我們來談論光。
What is light?
什麽是光？
Light is a form of energy, which our sense of sight can detect.
光是一種我們視覺可以探測到的能量形式。
It is made of electromagnetic radiation and travels in a straight path.
它由電磁輻射構成，并沿直綫傳播。
What is electromagnetic radiation?
什麽是電磁輻射？
Electromagnetic radiation is a type of wave that transfer energy.
電磁輻射，指的是電磁場的波。電磁波在空間中以波的形式傳遞能量和動量。
We can only see light within a certain range of wavelengths. This range is called the visible spectrum.
我們能看見的波長範圍有限。該範圍稱爲可見光譜。
What is the speed of light?
什麽是光速？
The speed of light is the speed at which light travels.
光速是光傳播的速度。
It is about 300,000 kilometres per second.
大約是每秒30萬公里。
Why are there different colours of light?
爲什麽會有不同顔色的光？
There are different colours of light because they are light waves which have different wavelengths.
有不同顏色的光，因為它們是具有不同波長的光波。
Red light has the longest wavelength while violet light has the shortest wavelength.
紅光波長最長，紫光波長最短。
What is reflection?
什么是反射？
The bouncing back of light waves when they hit an object with a very smooth and shiny surface, like a mirror, is called reflection.
當光波撞擊到表面光滑和有光澤的物體时，如鏡子，光波的反彈稱為反射。
What is refraction?
什麼是折射？
The bending of light as it passes from one transparent substance to another, like air to water, is called refraction.
光從一種透明物質傳遞到另一種透明物質時發生的彎曲，就像空氣到水一樣，稱為折射。
Source of light energy.
光的来源
Light sources can be two groups.
光源可分爲兩組
1. Natural light sources produce light naturally
without any human involvement.
自然光源產生於自然不需要人類的參與。
Examples: sun, lightning, fireflies.
例如：太陽，閃電，螢火蟲。
2. Artificial light is light made by humans.
人造光源是人類製造的光
Examples: light bulbs, candlelight, fireworks.
例如：燈泡，燭光，烟花。
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