With the present generators, it has been possible for the ultrasonics to reach up to the wave‐length of visible light but there is a wide divergence between the order of their frequencies. The improvement of ultrasonic wave generators is suggested to reach still higher frequencies which might exhibit some of the dormant properties of the ultrasonics. The investigation of interaction of such high energy ultrasonics with matter is interesting, and it may decide whether the sound wave has also got a dual aspect.