Atuning fork, frequency 385/sec produces resources with a closed tube 20cm long and 4cm in diameter what is the speed of sound? [338m/s]

308 m/s

Explanation:

In a closed tube, the length of the tube (L) is related to the wavelength of the standing wave () by the relationship

In this problem, the length of the tube is L=20 cm=0.20 m, so we can find the wavelength of the standing wave:

And no we can find the speed of the sound wave by using the following equation:

where is the frequency of the wave. So, we find