Question

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1. what are the 7 forms of electromagnetic radiation?
2. which form of electromagnetic radiation has the least energy?
3. which form of electromagnetic radiation is used in remote controls? wavelength 700nm to 1 millimeter uses heating night vision remote controls
4. which form of electromagnetic radiation has the highest energy?
5. how do microwave ovens heat food?

Explanation:

1. The 7 forms of electromagnetic radiation are radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X - rays, and gamma rays. This is based on the electromagnetic spectrum which classifies radiation by wavelength and frequency.
2. Radio waves have the least energy as they have the longest wavelengths and lowest frequencies in the electromagnetic spectrum. Energy is inversely proportional to wavelength for electromagnetic radiation.
3. Infrared radiation is used in remote - controls. It has wavelengths in the range that can be detected by sensors in remote - control receivers.
4. Gamma rays have the highest energy as they have the shortest wavelengths and highest frequencies in the electromagnetic spectrum.
5. Microwave ovens heat food by emitting microwaves that are absorbed by water molecules in the food. The microwaves cause the water molecules to vibrate rapidly, generating heat through friction.

Answer:

1. Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X - rays, gamma rays.
2. Radio waves.
3. Infrared radiation.
4. Gamma rays.
5. By emitting microwaves that are absorbed by water molecules in the food, causing the water molecules to vibrate rapidly and generate heat through friction.