Hi Guys! I am intrested in physics as amateur and this is my first post so be nice please :) What I wonder is about soundwaves but I don't know if this is the right section to write... If not, you may move the thread to appropriate section. My question has two steps. 1. I have a soundwave in 686Hz. In music, it is somewhere between G4 and G#4. But I am producing only 1 wave. The expansion of half wave in the air will be half of a meter (as the speed of sound 343m/s.) and it will create a pulse on the eardrum for a duration of 1/686 seconds (1.45 ms.) Is human ear capable to hear that short duration of impact? If it's pratically "yes", would it still be a perceptible G4 or G#4 sound? 2. If the above answer is "no" then, let's assume it is theorically "yes". This time I have a 343Hz. soundwave. It is somewhere between G3 and G#3 in music. But somehow I succeed to put out only the half of 1 wave. The length of the half wave will be half of a meter and the perception in the ear will be like the example above again. As I said before, let's assume that we can hear such short duration of sound. Then, would half soundwave still be a semantic sound can be perceived by human ear or any testing device? Thanks a lot!