[填空题]
A uniform narrow tube 1.80 m long is open aa*b c/aj/why /t bothq) e0x*31ims cp9kjk b ends. It resonates at two successive harmonics of fri 0q* 9e3)pjkskxc1m bequencies 275 Hz and 330 Hz. What is
(a) the fundamental frequency, Hz
(b) the speed of sound in the gas in the tube?$\approx$ $ \times10^{2 }$ m/s