9. An efficient LED light bulb uses energy at a rate of 7 watts or 7 J/second. What total amount of electrical energy is used if the light is on for 2 hours?

electromagnetic waves travel through space with vacuums. give me brainliest if right.

i would like to make dinner for my mom, dad, and sister

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.