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Doppler effect for light        Calculates the wavelength of light altered by Doppler effect for light.   Doppler effect for sound        Calculates the frequency of sound altered by Doppler effect for sound.   Velocity of sound in air        Calculates the speed of sound in air.   Velocity of sound in sea-water        Calculates the velocity of sound in sea-water and draws the chart of the relation with depth.   Decibel from the ratio of amplitudes        Converts the ratio of amplitudes into a decibel.   Ratio of amplitude from decibel        Converts the decibel value (gain) into the input-and-output ratio of voltage or power.

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