Choose all the different methods that you used in the experiment to determine the fundamental frequency of a sound By measuring the difference in frequency between two adjacent harmonics. By measuring the period of the wave using its waveform By counting how many cycles occurred in a time of 1 second in the waveform By measuring the frequency separation between two adjacent peaks in the waveform By measuring the decibel level of the 1st harmonic in either the spectrogram or spectrogram slice By measuring the frequency the 1st harmonic in either the spectrogram or spectrogram slice. By asking a classmate what they got for frequencies.