Timens魂 發問時間: 社會與文化語言 · 1 0 年前

下W1 就要交答案了 是光的基本問題

1.What is 光?

舉例?

2.為何發光?

如果不發光 如何看到?

3.What is 光線?

(1) 定義?

(2) 有無單位?(A)有 How many?

(B)無 Why?

2 個解答

評分
  • 1 0 年前
    最佳解答

    1.What is 光? According to quantum mechanics, 光 Light is a form of energy, travelling in waves. It can also be looked at as a particle, called photons, so that it can travel through absolute vacuum.

    舉例?

    2.為何發光? Because light is energy, energy always travels and that is where we humans can detect the light.

    如果不發光 如何看到? If the photons do not travel, then we could not see them. Since they always travel, we can detect them either directly [let them come into our eyes] or through instruments.

    3.What is 光線? It is just light. 光線 is just a colloquial expression of 光.

    (1) 定義? Given above already.

    (2) 有無單位?(A)有 How many? Light may have more than one attributes. One is wavelength. A is one of the way to express the wavelength of the light [there are other ways]. Other attributes are frequency, in gigahertz, and intensity, in lumens, etc.

    (B)無 Why? 有單位

  • 1 0 年前

    1)何謂光?

     答:光為光源發散之電磁波

    2)為何發光? 如果不發光 如何看到?

     答:物質受到能量能量的改變,以光子為介質發散能量;

       蝙蝠及鯨魚皆可用聲波回聲感應物體,但並非用眼睛"看"

       ,軍事用夜視鏡可利用發熱物體所發散之紅外線在黑暗中看

       到發熱體,但紅外線、紫外線、幅射...等,都是光在不同頻

       率之名稱,故沒有光是無法用眼睛"看"到的

    3)何謂光線?

     定義:原子以發散光子所產生的能量射線

     單位:光的亮度單位:燭光

          能量單位:焦耳

          色溫單位:K

    參考資料: 物理知識
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