[填空题]
The A string of a violin ix*(jarisok042 /oz f z e.2kfjc( i6jss 32 cm long between fix1fb:/zrbaz9f ey 8 j-sed points with a fundamental frequbb8ej9af z/s: 1fzy-r ency of 440 Hz and a mass per unit length of $6.1 \times10^{-4 }$ kg/m
(a) What are the wave speed and tension in the string? $ \times10^{2 }$ m/s N
(b) What is the length of the tube of a simple wind instrument (say, an organ pipe) closed at one end whose fundamental is also 440 Hz if the speed of sound is in air? m
(c) What is the frequency of the first overtone of each instrument? Hz Hz
