RM asked in 科學及數學其他 - 科學 · 1 decade ago

輻射的行走速度=光速?急<-<20點

仲有幾條問題想問埋..qq您

1.地表如何把太陽輻射轉化為熱能

2.輻射的行走速度=光速?

3.為何水份子在蒸發時須要吸取熱能.

3 Answers

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  • Chau
    Lv 5
    1 decade ago
    Favorite Answer

    1. According to the theory in 'black body radiation', any object emits electromagnetic (EM) radiation as long as it has a temperature. The wavelength of the most intense radiation emitted by the object depends on its temperature. The higher the temperature of the object, the emitting intense radiation shifts towards short wavelength (i.e. high frequency) ends. The reason is that substances emit EM radiation because of vibrations of the molecules. The vibrational energy is emitted in the form of EM radiation, generally in the infrared range. 這表示,太陽可以發出所有的EM WAVE.包括無線電波,微波,紅外線,可見光,紫外線,X-RAY,伽瑪射線.其中,紅外線是用來傳送熱能的,這便直接提供了地球的熱能.

    2. 光是輻射的一種,所以輻射的速度=光速.所有輻射的傳送速度都是3*108ms-1.

    3.因為水份子須要動能才可以離開水表面,而熱能可以轉換成水份子的動能,因此,水份子可以透過吸取熱能蒸發

  • 1 decade ago

    1. 太陽輻射本是熱能之一種 , 不用轉化.

    2. 錯 , 光輻射只是輻射的一種 , 還有Thermal Radiation ,

    Electromagnetic Radiation or Black Body Radiation.

    3. 因為water molecules have to absorb energy for the kinetic energy

    which is necessary forwater molecules to move out of the water

    surface.

    Source(s): wiki + myself
  • 1 decade ago

    2.因為光是幅射的一種,所以輻射的行走速度=光速!

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