What is the prefix for ecosystem and what does the prefix mean

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f