Ultrasounds (1949)

The film explains the concept of sound, distinguishing between audible and inaudible frequencies. It describes how sound waves are created through vibrations, how they can be visualized using electrical devices, and how different frequencies affect pitch. The film demonstrates the properties of sound waves, including their ability to travel through air and water, their energy, and their applications in navigation, material testing, and medical therapies. It also highlights the use of ultrasound for mixing substances and therapeutic purposes, likening it to a form of massage.

Keywords
sound, sound waves, vibrations, pitch, ultrasound, visualization, navigation, material testing, medical therapy, energy, mixing substances

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