The basal thermal radiation experiments including intensity of thermal radiation, inverse square law and Stefan Boltzmann law have been studied using PASCO thermal radiation system. The experimental result is fitted, and it is in good agreement with theoretical values. 利用PASCO热辐射实验装置,进行了辐射体辐射出射度、反平方定律、斯特藩-玻尔兹曼辐射定律等基本实验的研究,并对测量结果进行了数据拟合,实验结果和理论模拟符合得很好。
The dose attenuation of source in air is different from the calculated results by inverse square law correction within 4? cm. The deviation is less than 3 %, within 4 cm but it increased with the increase of source distance. 源在空气中剂量衰减与源强反平方定律比较,在距源中心<4cm范围内,其偏差值≤3%,但随着距离增大,偏差值增大;
Correction to inverse square law can be calculated precisely with data obtained from the spherical ionization chambers exposed to fine collimated γ ray beam. 用准直γ细束照射球形电离室得到的数据可用来较精确地算出反平方律改正。
The experimental results show that a single-frequency continuous wave does decay as the inverse square law of the distance ( r ~ ( - 2 )) alter the Rayleigh distance, and in contrast, a pulsed EM wave decreases more slowly as r ~ ( - 2 (?) 实验结果表明:单频连续波在瑞利距离之后的确表现为随距离的反平方律(r~(-2))衰减;
Based on the theorems of momentum and angular momentum, a new method for determining the orbit in central force field of inverse & square law is given by the transformation of unit vectors in two coordinate systems. 根据动量定理和角动量定理,通过直角坐标系和平面极坐标系单位矢量的变换,给出了推导平方反比有心力场中轨道的一种新方法。