An experiment is designed to test what color of light will activate a photoelectric cell the best. The photocell is set in a cir
cuit that "clicks" in response to current. The faster the current, the more clicks per minute. In this experiment, the number of clicks in one minute is recorded for each color of light shining on the photocell. To change the color of light, a different color of cellophane is placed over the same flashlight and the flashlight is then located a specific distance from the photocell. In the above experiment, which factor is the independent variable? the number of clicks the color of the light the original source of the light the photocell
the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of the Earth.
