Question

multiple choice question
light ______ in water can be measured by simple means, such as with a secchi disk, or with more modern techniques that employ a beam of light projected to a submerged photocell.
color
attenuation
speed
need help? review these concept resources.

Explanation:

A Secchi disk is used to measure how far light can penetrate water, which is related to light attenuation. Light color is not measured this way, and light speed in water is a different physical - property not measured with a Secchi disk.

Answer:

B. attenuation