E-Activity 10

Copy and complete the following sentences.
1. The case of a microwave oven is made of _____ this ____microwaves.
2. Food contains ____molecules. These _____microwaves and become hot.
3. The food is put into containers made of _____, _____ or _____. These materials allow microwaves to pass through them very easily. We say that they _____ the microwaves.
4. We use a _____ dish to collect enough microwaves for a strong signal. This _____ the microwaves on to an aerial.
5. The aerial transfer’s energy from the microwaves as an ______signal.
6. X-rays can pass easily through skin and flesh but not through _____ or _____.
7. Photographic _____ absorbs any X-rays that fall on it. These parts of the film then go _____ when the film is developed.
8. Gamma radiation can kill living _____.
9. It is used to kill harmful _____ or _____ cells inside people’s bodies.
10. Radiation from the sun, or from a sun bed, can give pale skins a _____. But it can also damage skin cells and cause skin _____. These things happen because of _____ radiation.
11. Some substances _____ ultraviolet radiation and use the energy to produce _____. We say that these substances are _____.
12. Toasters and grills cook food using _____ radiation. Foods become hot when they _____ this radiation.
13. Metal things _____ microwaves, even if they are full of small holes. Some microwaves can pass easily through the Earth’s _____. These microwaves are used to carry information to and from _____.
14. Infrared rays are used to control a _____ set or a _____ player, and to send telephone messages along _____ fibers.
15. In microwave ovens, the microwaves are strongly absorbed by _____molecules in food. The energy from the microwaves makes the food_____.