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A sound is produced under water then propagate to the surface of the water, and some...

A sound is produced under water then propagate to the surface of the water, and some of the sound is transmitted to the air. The speed of sound in water is 1450 m/s, the speed of sound in air is 330m/s. As the sound passes from water to air, the effect of the frequency f and the wavelength lambda is:

A. f and lambda remain unchanged
B. f unchanged but lambda increases
C. f unchanged but lambda decreases
D. f increases but lambda decreases
E. f decreases but lambda increases
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