1. What substance will radio waves pass through easily?
2. What happens when radio waves are absorbed by an aerial?
3. Why can’t you send a radio message to or from a submarine?
4. Why is it useful to be able to reflect long wavelength radio waves?
5. What is the wavelength of these radio waves?
6. What wavelengths of microwaves are used for satellite television? And why are these wavelengths used?
7. How is your instruction carried to the television set or video player?
8. Why must you point the remote control at the television set or video player?
9. Doctors can use X-rays to see whether your lungs are healthy. How do they know if there is diseased tissue in your lungs?
10. Why can X-rays and gamma rays cause cancer?
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