Microwave, X-ray and infra-red radiation can all damage living tissues.
Which of the following statements correctly explain why this damage occurs?
- Microwaves cause damage because they are absorbed by water molecules.
- X-rays cause damage because of their ionising ability.
- Infra-red waves cause damage because of their ability to penetrate matter.
Answer:
3) D
1 – Microwaves do get absorbed by water molecules. An example of this when water molecules in food absorb microwaves from the microwave oven and heat up the food.
2 – The ionising properties of X rays means that they can damage the DNA in the cells of the human body.
3 – Infra red waves do not penetrate matter
Only statements 1 and 2 are correct so D is correct