A Secchi disk is used to measure the attenuation of
A) light.
B) sound.
C) density.
D) viscosity.
E) pressure.

Question

Quizplus · Accepted Answer

A Secchi disk is a circular disk, typically white or black and divided into quadrants, that is lowered into water until it is no longer visible. The depth at which the disk disappears from view, called the Secchi depth, is used to measure the attenuation of light in the water. This measurement is used to determine the transparency or turbidity of the water.

A Secchi Disk Is Used to Measure the Attenuation of