EM waves - 3.10-3.13 (mocks)

What is a light a part of?

A continuous electromagnetic spectrum

What do all waves in the electromagnetic spectrum do in free space?

Travel at the same speed

What is the order of the electromagnetic spectrum? (In terms of decreasing wavelength and increasing frequency)

Radio waves

Microwaves

Infrared

Visible light

Ultraviolet

X-rays

Gamma rays

Explain some of the uses of electromagnetic waves: radio waves

Broadcasting and communications

Explain some of the uses of electromagnetic radiations: microwaves

Cooking and satellite transmissions

Explain some of the uses of electromagnetic radiations: infrared

Heaters and night vision equipment

Explain some of the sues of electromagnetic radiations: visible light

Optical fibres and photography

Explain some of the sues of electromagnetic radiations: ultraviolet

Fluorescent lamps

Explain some of the uses of electromagnetic radiations: x-rays

Observing the internal structure of objects and materials, including for medical applications

Explain some of the uses of electromagnetic radiations: gamma rays

Sterilising food and medical equipment

Explain the detrimental effects of excessive exposure of the human body to electromagnetic waves + simple protective measures: microwaves

Internal heating of body tissue

Microwave ovens need to have shielding to prevent microwaves from reaching the user

Explain the detrimental effects of excessive exposure of the human body to electromagnetic waves + simple protective measures: Infrared

Skin burns

Protect yourself using insulating materials to reduce amount of IR reaching your skin

Explain the detrimental effects of excessive exposure of the human body to electromagnetic waves + simple protective measures: Ultraviolet

Damage to surface cells and blindness

Wear suncream with UV filter whenever you’re out in the sun, and stay out of strong sunlight to protect your skin form UV radiation

Explain the detrimental effects of excessive exposure of the human body to electromagnetic waves + simple protective measures: Gamma rays

Cancer, mutation

Radioactive sources of gamma rays should be kept in lead-lined boxes when not in use

When people need to be exposed to them e.e.g in medical treatment, the exposure time should be as short as possible