之间的区别Light and Radio Waves

光和无线电波

Energy is one of the primary constituents of the universe. It is conserved throughout the physical universe, never created or never destroyed but transforming from one form to another. Human technology, primarily, is based on the knowledge of methods to manipulate these forms to produce a desired outcome. In physics, energy is one of the core concepts of investigation, along with matter. Electromagnetic radiation was comprehensively explained by physicist James Clarke Maxwell in 1860`s.

电磁辐射可以视为横向波，其中电场和磁场彼此垂直于垂直，并沿繁殖方向振荡。波的能量在电场和磁场中，因此，电磁波不需要传播介质。在真空中，电磁波以光速传播，这是一个常数（2.9979 x 10⁸ms^-1). The intensity/strength of the electric field and the magnetic field has a constant ratio, and they oscillate in phase. (i.e. the peaks and the troughs are occurring at the same time during propagation)

电磁波具有不同的波长和频率。基于频率，这些波显示的属性不同。因此，我们命名了具有不同名称的不同频率范围。光和无线电波是具有不同频率的电磁辐射的两个范围。当所有波列在上升或降序顺序中，我们称其为电磁频谱。

光波

光是波长380 nm至740 nm之间的电磁辐射。这是我们眼睛敏感的光谱范围。因此，人类使用可见光看到事物。人眼的颜色感知基于光的频率/波长。

With the increase in frequency (decrease in the wavelength), the colors vary from red to violet as shown in the diagram.

EM频谱中紫罗兰色之外的区域被称为Ultra Violet（UV）。红色区域下方的区域称为红外线，热辐射发生在该区域。

The sun emits most of its energy as UV and visible light. Therefore, life developed on earth has a very close relationship to the visible light as an energy source, media for visual perception, and many other things.

无线电波

The region is the EM spectrum below the infrared region is known as the Radio region. This region has wavelengths from 1mm to 100km (the corresponding frequencies are from 300 GHz to 3 kHz). This region is further divided into several regions as given in the table below. Radio waves are basically used for communication, scanning, and imaging processes.

乐队名称	缩写	ITU band	Frequency and wavelength in the air	用法
Tremendously low frequency	TLF		< 3 Hz > 100,000公里	天然和人造电磁噪声
Extremely low frequency	精灵	3	3–30 Hz 100，，，，000km – 10,000 km	与潜艇的沟通
超低频率	SLF		30–300 Hz 10,000公里 - 1000公里	与潜艇的沟通
超低频率	ULF		300–3000 Hz 1000公里 - 100公里	潜艇通信，矿山内的通信
频率非常低	VLF	4	3–30 kHz 100公里 - 10公里	Navigation, time signals, submarine communication, wireless heart rate monitors, geophysics
低频	如果	5	30–300 kHz 10km – 1 km	导航，时间信号，AM长浪广播（欧洲和亚洲部分），RFID，业余广播
Medium frequency	MF	6	300–3000 kHz 1公里 - 100 m	AM (medium-wave) broadcasts, amateur radio, avalanche beacons
High frequency	HF	7	3–30 MHz 100m – 10 m	Shortwave broadcasts, citizens’ band radio, amateur radio and over-the-horizon aviation communications, RFID, Over-the-horizon radar, Automatic link establishment (ALE) / Near Vertical Incidence Skywave (NVIS) radio communications, Marine and mobile radio telephony
非常高的频率	VHF	8	30–300 MHz 10m – 1 m	FM, television broadcasts and line-of-sight ground-to-aircraft and aircraft-to-aircraft communications. Land Mobile and Maritime Mobile communications, amateur radio, weather radio
超高频	UHF	9	300–3000 MHz 1 m – 100 mm	Television broadcasts, microwave ovens, microwave devices/communications, radio astronomy, mobile phones, wireless LAN, Bluetooth, ZigBee, GPS and two-way radios such as Land Mobile, FRS and GMRS radios, amateur radio
超高频	SHF	10	3–30 GHz 100毫米 - 10毫米	射电天文学，微波设备/通信，无线LAN，大多数现代雷达，通信卫星，卫星电视广播，DBS，业余无线电
Extremely high frequency	EHF	11	30–300 GHz 10mm – 1 mm	Radio astronomy, high-frequency microwave radio relay, microwave remote sensing, amateur radio, directed-energy weapon, millimeter wave scanner
Terahertz or Tremendously high frequency	thz或thf	12	300–3,000 GHz1 mm - 100μm	Terahertz Imaging - 在某些医学应用，超快分子动力学，凝结物理学，Terahertz时域光谱，Terahertz Computing/Compucations，Sub-MM遥感，业余无线电无线电上的潜在替换X射线

[Source: http://en.wikipedia.org/wiki/Radio_spectrum]

光波和无线电波有什么区别？

• The radio waves and light are both electromagnetic radiations.

•与无线电波相比，从相对较高的能量源/过渡发出光。

• Light has higher frequencies than radio waves and has shorter wavelengths.

• Both light and radio waves display usual properties of waves, such as reflection, refraction, and so forth. However, the behavior of each property is dependent on the wavelength/ frequency of the wave.

• Light is a narrow band of frequency in the EM spectrum while radio occupies a large portion of the EM spectrum, which is further divided into different regions based on the frequencies.