If the answer is in scientific notation, please convert!

In the figure, sound with a 43.5 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r that results in an intensity minimum at the detector? (Take the speed of sound to be 343 m/s.) Detector Number Units This answer has no units . (degrees) Hint cm ka S Save for Later Attempts: 0 of 1 used Submit Answer m/s m/s* 2 N J W M/m kg-my/'s or N.s Nim* 2 or Pa times