Why is the standard sampling frequency 44.1 KHz?
Interesting question. Wikipedia seems to give one simple reason: human hearing range is around 20Hz ~ 20kHz, so by the Nyquist–Shannon theorem (mentioned later in class), the sampling frequency must be at least 40kHz. (more reasons are given in the original article: https://en.wikipedia.org/wiki/44,100_Hz)
@zyx Yes, very nice answer.