Why might measuring changes in speed or direction be important?

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.

Awalk up the phase change graph worksheet

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem