Ratio waves are one directional or …

One -way mirrors and one-way streets both permit flow in just one direction , but it is difficult to create something that permits sound or other waves to ripple in one direction and not the opposite. This is because of a fundamental property known as time-reversal symmetry.it usually makes no difference from what direction.a sounds is created_if you hear , you can be heard. Radio waves are normally omnidirectional.when an antenna transmits ratio waves, they arepropagated in all directions . this means that the sending and receiving antennas do not have to be aligned . the omnidirectional characteristics of ratio waves make them useful for multicasting ,in which there is onesender but many receivers . our AM and FM radio stations , cordless phones and televisions are examples of multicasting.