60 i think
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10 decibels increase mean measured on a sound pressure level meter. SPL meter. Forget the intensity, because the ear drums and the microphone diaphragms are moved by the sound pressure. 10
20
Pythagoras discovered the properties of string length, and that certain ratios of string length are more pleasing to the human ear. The ration is 3:2.
1000 Hz. The others are outside the range of human hearing. You can feel 10 Hz but not hear it. C. 1,000 Hz
An ear of corn averages 800 kernels in 16 rows.