Microwaves and infrared radiation are both used to cook food.
The speed of electromagnetic waves is 3.0 × 108 m/s.
A grill emits infrared radiation with a wavelength of 1.0 × 10-5 m.
Calculate the frequency of this infrared radiation.
A microwave oven emits microwaves with a wavelength of 0.12 m.
Calculate how many times greater the frequency of the infrared radiation is than the frequency of the microwaves.
A chef says:
'The infrared radiation from the grill is more dangerous than the microwaves from the oven, because I can feel the grill heating my skin.'
Discuss the chef's statement.
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.