Electromagnetic+Spectrum+&+Light

Electromagnetic Spectrum & Light

** Ele ctr o m a g net ic S pect rum **
 * All parts of spectrum- The parts of the Electromagnetic spectrum are all divided into the following groups; radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays.



=Electromagnetic Spectrum - Wavelength, Frequency, And Energy. = The electromagnetic spectrum has a continuous range of frequencies or wavelengths of electromagnetic radiation, ranging from long wavelength, low energy radio waves to short wavelength, high frequency, high-energy gamma rays.

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= Speed of light; = The speed of light (about 300,000 km/s - over a billion k.p.h.), Light travels at a speed of 186,000 miles a second or 700 million miles an hour.



 = The Visible Light Spectrum  =
 * Visible Light (colours); Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light.When white light shines through a prism, the white light is broken apart into the colors of the visible light spectrum. Water vapor in the atmosphere can also break apart wavelengths creating a rainbow.How is this knowledge used in everyday life;

How is this knowledge used in everyday life ? This knowledge can be used in everyday life; its how we see colours and its how we know what colours they are.

**Why is the sky blue? Where do the colours for sunset and sunrise come from?** A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

**So what do you need to make a rainbow?** You need water and sunlight, and just the right amount of both.