electromagnetic spectrum 19 may 2015 all waves in the electromagnetic spectrum are transverse waves...

Electromagnetic SpectrumElectromagnetic Spectrum

April 18, 2023

All waves in the Electromagnetic Spectrum

•Are transverse waves•Travel at the same speed ( 3 x 108ms-1 in a vacuum)•Can travel through a vacuum


April 18, 2023

RADIO MICROWAVES INFRA RED VISIBLEULTRA VIOLET X RAYS

GAMMA RAYS

Increasing Wavelength

Increasing Frequency


April 18, 2023


April 18, 2023

Wavelength: 1 mm – 50 cm Source: Electronics Detector: Aerial Properties/uses: Microwave ovens, radio telescopes, radar

RADIO

TELEVISION

MICROWAVES

INFRA RED

VISIBLE

ULTRA VIOLET

X RAYS

GAMMA RAYS

Wavelength: around 1 nm Source: Atoms Detector: Film Properties/uses: Medical X rays, defects in metals, checking paintings

Wavelength: 0.001 – 0.4 m Source: Atoms Detector: Skin, film Properties/uses: Sun tan, sun burn, theatre, checking documents, microscopes

Wavelength: 0.4-0.7 m Source: Atoms Detector: Eye, film Properties/uses: We use it to see the world around us

Wavelength: around 50 cm Source: Electronics Detector: Aerial Properties/uses: Television

Wavelength: 1 m – 1500 m Source: Electronics Detector: Aerial Properties/uses: Radio communication

Wavelength: around 1 pm Source: Nuclei Detector: Film, Geiger counter Properties/uses: Medical, sterilising food, checking metal castings, checking water flow

Wavelength: 0.7-10 m Source: Atoms Detector: Skin, thermometer, film Properties/uses: Physiotherapy, night sight, locating people trapped in smoke or ruins


April 18, 2023

Radio Waves

Radio waves are:

•Detected by aerials•Used for communication


April 18, 2023

Radio Waves

Radio waves are:

•Detected by aerials•Used for communication

Long wavelength radio waves are:

•Diffracted and so can be detected below the horizon and in the shadow of hills•Reflected by the ionosphere and so can be detected below the horizon


April 18, 2023

Microwaves

Microwaves can be demonstrated in the laboratory with the apparatus shown above and can be:

•Reflected my metal plates•refracted by wax•Diffracted by the gap between two metal plates


April 18, 2023

Microwaves are:

•Detected by aerials (diodes)•Used for

•Communication

Microwaves


April 18, 2023

Microwaves are:

•Detected by aerials (diodes)•Used for

•Communication•Cooking

Short wavelength micro waves are:

•Not diffracted and so can only be used for line of sight communication•Pass through the ionosphere and so can be used to communicate with satellites orbiting the Earth

Microwaves


April 18, 2023

Scientists believe that microwaves used by mobile phones can cause heating of cells and lead to permanent damage.

Microwaves


April 18, 2023

Infra Red, IR

Infra Red Radiation is:

Emitted by:•Hot objects


April 18, 2023

Infra Red, IR

Infra Red Radiation is:


Detected by:•Skin•Thermometers•Photographic Film

Used for:•VCR/DVD controllers•cooking

Infra Red Radiation can be:•Reflected by glass and so warms the interior of glass houses•Is radiated by the Earth into space and so cools the planet•Is reflected by carbon dioxide in the atmosphere and can lead to global warming


April 18, 2023

Infra Red, IR

Infra Red Radiation can be:•Reflected by glass and so warms the interior of glass houses


April 18, 2023

Infra Red, IR

Infra Red Radiation can be:•Reflected by glass and so warms the interior of glass houses

•Is radiated by the Earth into space and so cools the planet•Is reflected by carbon dioxide in the atmosphere and can lead to global warming


April 18, 2023

Red, orange, yellow, green, blue, indigo violet

White Light

The visible spectrum

The Visible Spectrum Visible light is:


Detected by:•The eye•Photographic Film

Used for:•seeing


April 18, 2023

The Visible Spectrum


April 18, 2023

Ultraviolet Radiation Ultra Violet Radiation is:


Detected by:•The skin•Photographic Film•Fluorescent paints

Used for:•Sunbeds


April 18, 2023




Used for:•Sunbeds•Security


April 18, 2023




Used for:•Sunbeds•Security•Hardening adhesives•Hardening fillings in teeth•Sterilisation of surgical instruments


April 18, 2023

X ray beam

copper anodefilament

heavy metal targetelectron beam

E.H.TvacuumX-Rays X – Rays are:

Emitted by:•atoms

Detected by:•Photographic Film

Wilhelm Konrad Roentgen


April 18, 2023

X ray beam

copper anodefilament

heavy metal targetelectron beam

E.H.TvacuumX-Rays X – Rays are:

Emitted by:•atoms

Detected by:•Photographic Film

Used for:•X-ray photographs in medicine•Detecting faults in metals and concrete

Will:•Damage human cells which may kill them or mutate them, leading to cancer

Wilhelm Konrad Roentgen


April 18, 2023

Gamma Radiation Gamma Radiation is:

Emitted by:•nuclei

Detected by:•Photographic Film•Geiger-Muller tubes


April 18, 2023

Gamma Radiation Gamma Radiation is:

Emitted by:•nuclei

Detected by:•Photographic Film•Geiger-Muller tubes

Used for:•Treating cancer•Detecting faults in metals and concrete•Sterilising surgical equipment•Killing bacteria on food

Will:•Damage human cells which may kill them or mutate them, leading to cancer


April 18, 2023

Electric field

Magnetic field

e.m. radiation

A Electromagnetic Wave

electromagnetic spectrum 19 may 2015 all waves in the electromagnetic spectrum are transverse waves...

Documents

electromagnetic spectrum

communication slide

radio waves radio waves

radio communication

microwaves microwaves

film propertiesuses

communication microwaves

vacuum slide