Microwaves
3 marks · NormalA student is comparing different ways microwaves and radio waves are used in technology. Complete the table below by stating one key use for each wave, and one safety concern linked to each.
| Wave | Example of a use | One safety concern |
|---|---|---|
| Microwaves | ||
| Radio waves |
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
Must show: Use example for each wave; safety concern for each wave.
Also accept: For microwaves: use = 'cooking food', 'satellite communication', 'mobile phones'; safety = 'can burn tissue', 'harm from excessive exposure'. For radio waves: use = 'radio broadcasting', 'TV signals', 'communication'; safety = 'none significant', 'at high power may cause harm' (accept ‘minimal risk’ or ‘no major concern’).
Common mistakes: Mixing up use and safety concern columns; Putting a use of one as the safety concern of another
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Correct use for microwaves.
B2 · 1 mark · Correct safety concern for microwaves.
B3 · 1 mark · Correct use and safety concern for radio waves.
Worked solution
| Wave | Example of a use | One safety concern |
|---|---|---|
| Microwaves | Cooking food in ovens / mobile phone communication | Can burn or heat body tissue with excessive exposure |
| Radio waves | Broadcasting radio and TV signals | No significant health risk at normal exposure levels |