A standing wave on a 77.4cm long string has three antinodes.
A. What's its wavelength?
B. If the string has linear mass density 3.92×10?5kg/m and tension 10.1N , what are the wave's speed?
C. If the string has linear mass density 3.92×10?5kg/m and tension 10.1N , what are the wave's frequency?