请问这个题中 120P 是什么意思啊？
时间：10-02
整理：3721RD
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1. What is the impedance of free space?
b) 120 p (376.991) ohms
Impedance is defined as the square root of the ratio of the permeability (mu, m) to the permittivity (epsilon, e) - in this case of free space.
e0 = 1/(36 p) * 10-9 F/m
m0 = 4 p * 10-7 H/m
z0 = sqrt [m0 / e0] = sqrt [4 p * 10-7 * 36 p * 109] = sqrt [144 * 102 * p2] = 120 p = 376.991 (377) W.
e0 = 1/(36 p) * 10-9 F/m
m0 = 4 p * 10-7 H/m
还有这两个公司怎么来的? 请各位大哥给指点一下,谢谢！
b) 120 p (376.991) ohms
Impedance is defined as the square root of the ratio of the permeability (mu, m) to the permittivity (epsilon, e) - in this case of free space.
e0 = 1/(36 p) * 10-9 F/m
m0 = 4 p * 10-7 H/m
z0 = sqrt [m0 / e0] = sqrt [4 p * 10-7 * 36 p * 109] = sqrt [144 * 102 * p2] = 120 p = 376.991 (377) W.
e0 = 1/(36 p) * 10-9 F/m
m0 = 4 p * 10-7 H/m
还有这两个公司怎么来的? 请各位大哥给指点一下,谢谢！
波阻抗公式Z0=sprt[uo/eo]
波阻公式我知道,但是不知道后面的 P 代表什么意思
我知道 了 是圆周率 Π ,不好意思啊,各位,抱歉
小编有责任
哈哈 知道了就好啊
Π＝PI