電磁波係咩? 我中三 請簡單一下 拜託 10點!

電磁波係咩?

電磁波,Electromagnetic Wave,EM Wave,

Generally,EM Wave Can Be Defined To The Sun Light,
Sun Light Always A White Light,Its So Basic Explaintion.

But Why Sun Light Have Heat Have Light And Have Energy?

It Is Because Light In White Color Have Difference Frequency(Wavelength)
Difference Frequency(Difference Wavelegth)Have Difference Purpose And Application.

Frequency And Wavelength Is Inversary Proportional.


Arrange Them In Ascending Order Based On Wavelength:

Commic Ray<Gamma Ray<X-Ray<Ultraviolet<Visible Light<Infrared<Microwave<Raio

The Wavelength And The Frequency Of Visible Light :

Red : 625nm-740nm(480-405THz)
Orange : 590nm-625nm(510-480THz)
Yellow : 565nm-590nm(530-510THz)
Green : 500nm-565nm(600-530Thz)
Light Grren : 485nm-500nm(620-600THz)
Blue(Indigo) : 440nm-485nm(680-620THz)
Violet(Indigo) : 380nm-4480nm(790-680THz)

1nm=10A
1THz=10^15 Hz


電磁波算唔算係物質?佔有質量/空間嗎?

It Not A Meterial,But It Have Mass(Particles) And Space BASED ON MY MEMORIES.


為什麼有些可以穿過身體?

Some EM Wave Carries More Energy,So That The Radiation Can Be Throught Tje Body,The Wave Can Be Diffraction,Polarize From The Sources As Well.

laiyukki 都發表得幾好 = =" 但係無得兩個都最好....."
佢都有盡力 希望其他人唔好話佢"

電磁波是能量之一
電磁波可以在真空中傳播
例如:伽瑪射線、無線電波和x射線等等

2009-12-12 12:28:21 補充：
光都是電磁波

電磁波是一種能量傳播
它們並不具有任何質量,亦不佔據空間
若能量足夠,那電磁波就能穿過身體

laiyukki,
你介定是物質就一定是佔有空間了吧
有稱之為&quot;物質&quot;但不佔有空間的物質嗎?

電磁波是電子之間傳播訊息的工具,例如你玩電路版(中學做實驗用果種circuit board),開燈果一下,後面既電子會「叫」前面電子行,果個「叫」既「聲」就係電磁波了(以上是簡單版)
電磁波不算物質,因為沒有質量,但是否佔有空間,我不清楚
電磁波按其頻率分類,頻率越高能量越大,在被外力拉住(重力)會令其頻率下降(消耗能量),頻率高的電磁波,如x光和伽碼射線,能量很大,所以能穿過身體