# Electromagnetic waves原文翻譯改順@@

===以下為原文與初版翻譯@@===

6.2 Electromagnetic Waves

6.2 電磁波

Other forms include infrared, visible light, ultraviolet, x-radiation, and gamma rays.

Figure 6.1 shows the place of radio waves at the low-frequency end of the frequency spectrum.

Electromagnetic radiation, as the name implies, involves the creation of electric and magnetic fields in free space or in some physical medium.

When the waves propagate in a transmission line consisting of a pair of conductors, the fields can be represented as voltages and currents.

When the propagation is in a dielectric medium or in free space, we need to work with the fields directly.

Both types of wave propagation are essential to wireless communication.

Sinusoidal waves of voltage and current should be familiar from basic electricity and from our studies of various signals earlier in this book.

When a sine wave propagates along a line or though space, it varies sinusoidally in both time and space.

Just as the time taken for one repetition of a wave is called the period, the distance between identical point on the wave, at the same instant of time, is known as the wavelength of the signal.

Another way of putting this is to say that the wavelength is the distance a wave travels in one period.

### 3 個解答

• 匿名使用者
1 0 年前
最佳解答

6.2 Electromagnetic Waves

6.2 電磁波

Other forms include infrared, visible light, ultraviolet, x-radiation, and gamma rays.

Figure 6.1 shows the place of radio waves at the low-frequency end of the frequency spectrum.

無線電波是電磁輻射的形式之一。

其它形式包括紅外線, 可見光、紫外線、x 光, 和伽馬射線。

圖6.1 顯示無線電波在頻率光譜中的低頻端所在的位置。

Electromagnetic radiation, as the name implies, involves the creation of electric and magnetic fields in free space or in some physical medium.

When the waves propagate in a transmission line consisting of a pair of conductors, the fields can be represented as voltages and currents.

When the propagation is in a dielectric medium or in free space, we need to work with the fields directly.

Both types of wave propagation are essential to wireless communication.

電磁輻射,如同這名字所透露, 牽涉到電與磁場在什麼都沒有的空間裡或是在實體的媒介中產生。

當信號波於一對導線中傳送, 其(信號波之電場)以電壓和電流的形態呈現。

當傳輸是在一個非導體媒介或在無物空間, 我們需要直接以電場的方式動作。

對無線通信波的這兩種傳輸都很重要(都是必要的)。

Sinusoidal waves of voltage and current should be familiar from basic electricity and from our studies of various signals earlier in this book.

When a sine wave propagates along a line or though space, it varies sinusoidally in both time and space.

Just as the time taken for one repetition of a wave is called the period, the distance between identical point on the wave, at the same instant of time, is known as the wavelength of the signal.

Another way of putting this is to say that the wavelength is the distance a wave travels in one period.

由基本電學或是本書稍早(之前)的各種訊號的介紹,應該對電壓和電流正弦波很熟悉了.

當正弦波信號沿著線傳送或穿過空間, 其時間和空間做正弦的變化。

週期為重複一個波所需要的時間, 如同時間的例子,波中兩個等位點之間的距離,稱之為訊號的波長。

另一個說法為, 波長是波於一個週期的時間所移動的距離

參考資料： Own work
• 登入以對解答發表意見
• 邱君
Lv 6
1 0 年前

謝謝，我也受惠了。

• 登入以對解答發表意見
• 匿名使用者
1 0 年前

Good Job!!

• 登入以對解答發表意見