Energy from the movement of electrons through a substance, like a copper wire. A. electromagnetic (radiant)
B. electrical
C. chemical
D. gravitational
E. thermal

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

k2s for potassium sulphide

the ima (higher than 1m) will be greater than the ima with the height of 1m.