09-27-2021, 08:57 PM
It is already highly appreciated by teachers in Germany as it is. 
I forgot to hit the “post reply” button on this part:
I observe an opposite effect for an air column of 66 mm: 1101.56 Hz by FFT and 1111.11 Hz by Autocorrelation. For 79 mm: 984.38 Hz vs. 984.62 Hz…
There is some oddity: I can do the measurement just once being different to previous versions. Furthermore, leaving the experiment and returning does not help, even starting Audio Spectrum and returning then does not. Hm… perhaps a phyphox bug.
I forgot to hit the “post reply” button on this part:
I observe an opposite effect for an air column of 66 mm: 1101.56 Hz by FFT and 1111.11 Hz by Autocorrelation. For 79 mm: 984.38 Hz vs. 984.62 Hz…
There is some oddity: I can do the measurement just once being different to previous versions. Furthermore, leaving the experiment and returning does not help, even starting Audio Spectrum and returning then does not. Hm… perhaps a phyphox bug.