RP 33 Ch.10-Ch.12

Select the active sonar equation.

SE = SL + TS - RD - LE - 2PL

SE = SL + TS + RD - LE - PL

SE = SL - TS - RD - LE - 2PL

SE = SL + TS + RD + LE + 2PL

_______ is defined as the signal-to- background-noise ratio required at the sonar reciever to enable an operator to recognize the presence of a signal 50% of the time.

signal excess

source level

recognition differential

target strength

The reduction in sound intensity (dB/kyd) caused by the absorption and scattering of sound in water is known as ________.

afternoon effect

attenuation

band level

bottom interaction

_____ is a form of electromagnetic energy that is selectively absorbed in water according to its color and wavelength.

x-ray

sound

light

wavelength

The intensity of bioluminescence is less in the open ocean than nearshore.

True

False

The depth in the water at which a refracted sound ray becomes horizontal is known as ______.

turbulence

vertex sound speed

vertex depth

turbulent depth

The grazing angle of a sound wave with the sea bottom at which total relfection occurs is known as _______.

critical depth

correlation

critical angle

continental slope

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