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Electrical Engineering

A source produces sound waves under water. Waves travel through water and then into air. Which of the following statements about the frequency (f) and the wavelength () is correct and sound passes from water to air? (1) f remains unchanged but  decreases. (2) f remains unchanged but  increases. (3)  remains unchanged but f decreases. (4)  remains unchanged but f increases.

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A source produces sound waves under
water. Waves travel through water and
then into air. Which of the following
statements about the frequency (f) and
the wavelength () is correct and sound
passes from water to air?
(1) f remains unchanged but  decreases.
(2) f remains unchanged but  increases.
(3)  remains unchanged but f decreases.
(4)  remains unchanged but f increases.
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3)  remains unchanged but f decreases.
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