The following standing waves are created in tubes. Which tube has a length equal to the wavelength of sound? O a Ob O c O dThe picture above shows two string of equal length and equal linear mass density. Each string is connected to a weight that hangs down, as shown. Both strings have standing waves at 100 Hz, as shown above in the diagram. What can be said about the weights of the two boxes? 0 a Both boxes have the same weight 0 b The weight of box A is bigger than the weight of box B O c The weight of box 8 is bigger than the weight of box A