At very high frequencies f ≳ k B T / h {\displaystyle f\gtrsim k_{\text{B}}T/h} , the function η ( f ) {\displaystyle \eta (f)} starts to exponentially decrease to zero.
在非常高的频率 f ≳ k B T / h {\displaystyle f\gtrsim k_{\text{B}}T/h} ，功能 η ( f ) {\displaystyle \eta (f)} 开始呈指数减少到零。