Henri becquerels original hypothesis was that fluorescent minerals became excited by solar energy and gave off x-rays however, after he discovered uranium mineral emitted there own radiation without the of solar energy he abandoned his hypothesis why did becquerel abandon his first hypothesis.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.

2) why do satelites not fall while revolving around the earth?