Visible light is the that our eyes can see.

Plss anybody know how to do this? ? i need the answers from a through d

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

Why is the use of carbon-14 limited