Under what conditions can sound be converted into light in water? Detailed answer

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Under what conditions can sound be converted into light in water? Detailed answer

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Under what conditions can sound be converted into light in water?

In the aquatic environment, sonoluminescence can be observed, that is, the transformation of sound into light. To do this, you need to lower a resonator into the water, which creates a standing spherical ultrasonic wave. In the rarefaction phase of the wave, due to very low pressure, a cavitation bubble appears, which grows for some time, and then quickly collapses in the compression phase. At this moment, a flash of light appears in the center of the bubble, and the observer sees a constant bluish glow, since the bubbles are born and collapse at a very high speed. According to the point of view prevailing in scientific circles, this radiation is of a thermal nature.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is the optimal number of social connections for a person?

English anthropologist Robert Dunbar has identified a relationship between the size of the neocortex of the cerebral hemispheres of primates and the size of their flock. Based on these data, he determined the optimal size of social ties for a person - 150. This number is confirmed in a variety of historical periods and locations: for example, this is the estimated number of inhabitants of a Neolithic settlement or the size of a basic unit of the Roman army. In 2010, Dunbar began researching the social network Facebook and came to the conclusion that his number also works there: despite the fact that some people have hundreds and thousands of friends on social networks, the average person can interact effectively with no more than 150 contacts.

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