An astronomical source emits radio waves with a frequency of 450 MHz. a. If earth is 20 light years from the source, and we measure an intensity of 8.5 x 10-10 W/m2 here on earth, what is the power of the source? b. What is the amplitude of the electric field of the wave at our location?

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.

it would be c. predictability

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank