The anode heel effect is more pronounced : A with rotating anodes.
when the collimator is not completely ope
C when the collimator is open wide
D a the anode

At the Anode.

Explanation:

Anode heel effect is the lower field intensity that occur at the anode compare to the cathode which is as a result of lower x-ray emissions from the target material at angles perpendicular to the electron beam.

It occur at the anode because the effect is stem when x-rays photons is absorbed before they leave the anode where they are produced.

because the light is a great source of energy for the plants to survive. (i hope this )

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.