Help with Science again.?

1.Describe the different types of energy changes that take place when a light switch is turned off.



2.A dentist uses an X-ray machine to examine teeth. X rays are considered harmful when used in large quantities, so a lead apron is placed on the patients chest. What is the purpose of the lead apron and how does it work?



3.Describe several similar characteristics of ocean waves, light waves from a lightbulb, and sound waves from a radio.



4.An automobile approching a traffic signal comes to a complete stop. What is the direction of the force acting on the automobile with respect to the motion of the automobile? Explain?Help with Science again.?1. Chemical, Thermal, and Electric.

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