iGCSE Physics - 3.3 Electromagnetic Spectrum CORE

This Powerpoint specifically covers all criteria for –
Unit 3.3 Electromagnetic Spectrum CORE

Know the main regions of the electromagnetic spectrum in order of frequency and in order of wavelength

Know that all electromagnetic waves travel at the same high speed in a vacuum

Describe typical uses of the different regions of the electromagnetic spectrum including:
(a) radio waves; radio and television transmissions, astronomy, radio frequency
identification (RFID)
(b) microwaves; satellite television, mobile phones (cell phones), microwave ovens
© infrared; electric grills, short range communications such as remote controllers for televisions, intruder alarms, thermal imaging, optical fibres
(d) visible light; vision, photography, illumination
(e) ultraviolet; security marking, detecting fake bank notes, sterilising water
(f) X-rays; medical scanning, security scanners
(g) gamma rays; sterilising food and medical equipment, detection of cancer and its treatment

Describe the harmful effects on people of excessive exposure to electromagnetic radiation, including:
(a) microwaves; internal heating of body cells
(b) infrared; skin burns
© ultraviolet; damage to surface cells and eyes, leading to skin cancer and eye
conditions
(d) X-rays and gamma rays; mutation or damage to cells in the body

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