# 品质因子

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1. 品质因子，2π乘以一个周期内最大能量和耗散能量的比值；2π乘以储存功率和耗散功率的比值。岩石的Q值范围为50到300。Q与其它度量吸收的值有如下关系：

${\displaystyle {\frac {1}{Q}}={\frac {\alpha V}{\pi f}}={\frac {\alpha \lambda }{\pi }}={\frac {hT}{\pi }}={\frac {\delta }{\pi }}={\frac {2\Delta f}{f_{\mathrm {r} }}}}$

${\displaystyle A\mathrm {e} ^{-\alpha x}\sin 2\pi f(t-{\tfrac {x}{V}})}$

${\displaystyle A(t)=A_{0}\mathrm {e} ^{-ht}\cos \omega t\ }$

Absorption terminology. Sometimes this terminology is used for attenuation because of factors other than absorption. E = energy, ${\displaystyle \Delta E}$ = energy lost in one cycle, ${\displaystyle \lambda }$ = wavelength, f = frequency, x = distance, t = time, ${\displaystyle {\frac {A}{A_{0}}}={\frac {\text{amplitude}}{\text{initial amplitude}}}}$, ${\displaystyle {\frac {A_{1}}{A_{2}}}={\frac {\text{amplitude}}{\text{amplitude one cycle later}}}}$.[1]

2. 电路的阻抗和电阻的比值。

3. 描述滤波器锐度的项，中点频率与通频带宽度的比值（一般在3dB）。

4. 拉夫波的标志（参见Love waves)。

5. 科尼斯贝格比（参见 Koenigsberger ratio)。

6. 参见Q-type section。