急!! 物理easy問題 10點

輻射是指電磁波的傳遞，能量透過電場和磁場的不斷交換而傳播，所以是不需以媒介作傳播的。

原子吸收特定頻率的光後，其電子的勢能會被躍升，當電子的勢能位置再回落時，電磁波就會被輻射出來。

其輻射的能量方程： E=hv
h = 普朗克常數 (6.626 x 10^ -27)
v = 頻率

Light, microwaves, x-rays, and TV and radio transmissions are all kinds of electromagnetic waves. They are all the same kind of wavy disturbance that repeats itself over a distance called the wavelength.
therefore,咁輻射係用o係everything....
When u are answering questions, see if there is any medium,if no. usually the ans. is 輻射^^
More about EM wavea...
The wave, or "disturbance," is in an invisible thing called the electric force field. To understand electric forces, we have to learn something about charged particles like electrons and protons. Without these charged particles, there can be no electric force fields and thus no electromagnetic waves.

Go to---->http://www.colorado.edu/physics/2000/waves_particles/

輻射可以在真空傳熱
因為輻射係infra-red radiation 係電磁光譜
波長比可見光長d 電磁波可以在真空傳導
輻射不需透過粒子既碰撞同移動傳熱