Electromagnetic Radiation Flashcards

Flashcards about Electromagnetic Radiation

Electromagnetic Radiation

Accelerating charges induce a magnetic field at right angles to the direction of movement.

Electromagnetic Waves

EM waves consist of oscillating magnetic & electric fields in a plane at right angles to it.

Wave Nature Properties

Reflection, refraction, interference

Particle Nature Properties

Collisions

Speed of light (c)

3 x 108 m.s-1

Electromagnetic Spectrum

Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma ray

Red Light

Long wavelength, Low frequency, Low energy

Violet Light

Short wavelength, High frequency, High energy

Examples of Electromagnetic Waves

Radio waves, Microwaves, Infrared waves, Visible light waves, Ultra-violet waves, X-rays, Gamma rays

Uses of Radio Waves

Radio & Television broadcasts, radio telescopes

Uses of Microwaves

Telephone communications, communication satellites, cellphone connections, radar systems, radar speed traps, microwave ovens

Uses of Infrared Light

Remote control of TV, optical fibres for internet connections, keeping food warm in restaurants

Uses of Visible Light

Objects reflect light which allows us to see them, Photosynthesis in plants

Uses of Ultraviolet Light

Lighting, fluorescent pens, sterilisation of food and appliances; prolongs shelf life of food

Uses of X-Rays

CT scans, security scanners, medical images (penetrate soft tissue not bone)

Uses of Gamma Rays

Radiation for cancer

Formula for speed of light

c = fλ

Radiation with most penetrating power

Gamma rays

Photon

A packet of energy found in light

Energy of Photon

E = hf

Planck's constant (h)

6.626 x 10-34 joule-seconds (Js)