1. What portion of electromagnetic spectrum is covered by thermal radiation? 2. What is the range of wavelength for visible radiation, i.e. light? 3. What do you mean by infrared and ultraviolet...

1. What portion of electromagnetic spectrum is covered by thermal radiation?

2. What is the range of wavelength for visible radiation, i.e. light?

3. What do you mean by infrared and ultraviolet radiation?

4. Why are microwave ovens suitable for cooking?

5. What is the speed of energy propagation between two bodies when the intervening space is vacuum?