lucy has three sources of sound that produce pure tones with wavelengths of 84 cm , 140 cm , and 40 cm . she also has an assortment of narrow tubes that are closed off at one end but open at the other. after experimenting, lucy notices that each tone will resonate with tubes of some lengths but not with others. for each wavelength, determine which tube lengths, if any, will resonate with sound of that wavelength.
