輻射Radiation(中三)

咁我中英對照啦 =]

其實仲有其他的因素,包括
溫度:
物體溫度較外界高,物體會發射幅射,變得較凍.
物體溫度較外界低,物體會吸收幅射,變得較熱.
質料:
表面較粗糙的物體係較好的輻射發射體同吸收體.
表面較平滑的物體係較差的輻射發射體同吸收體.
表面面積:
表面面積較大的物體,發射同吸收幅射速率較高.


There are other factors,including
Temperature:
The temperature of object is higher than outside,it will emit radiation and become cool.
The temperature of object is lower than outside,it will emit radiation and become hot.
Metal:
The rougher object is a better absorber and radiator.
The smoother object is a worse absorber and radiator.
Surface area:
The object which has bigger surface area emits or absorbs radiation faster.

The surface area and temperature of the object.
Objects with larger surface areas will emit/absorb thermal radiation more than those with smaller surface areas.
Also, the emission and absorption of thermal radiation by an object is proportional to the fourth power of its absolute temperature (Stefan's Law). That is to say, objects at higher temperature tend to emit radiation more than objects at low temperatures.