Wavelengths Between Red & Violet

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Description

Wavelengths Between Red & Violet

TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
No! The visible spectrum is just the small part of the electromagnetic spectrum our eyes are tuned to.
The unit used to measure wavelength is the metre. Because the size of electromagnetic waves varies, different prefixes are used to aid measurement. Here are six examples: kilometre, centimetre, millimetre, micrometre, nanometre and picometre.
The visible spectrum is the small part of the electromagnetic spectrum our eyes are tuned to.
Yes! The visible spectrum is composed of wavelengths between 390 to 700 nanometers and each wavelength is associated with a different colour.

About the diagram

About the diagram
  • This diagram is about which wavelengths of electromagnetic radiation correspond with the different colours we see in the world.
  • It shows that whilst the visible spectrum often appears to an observer to be made up of six bands of colour, every wavelength between 700 and 380 nanometres corresponds with a different colour.
  • The scale along the bottom of the diagram is marked in nanometres with the corresponding colours shown above.
Remember that:
  • Objects appear to be different colours to an observer depending on the wavelengths they reflect.
  • The name given to light that contains all wavelengths of the visible spectrum is white light.
  • When all wavelengths contained in white light reflect off a neutral coloured surface then the object appears white to an observer.
  • When one or several bands of wavelengths reflect off a neutral coloured surface then the object appears coloured to an observer.
  • The colour an observer sees depends on the wavelengths of visible light emitted by a light source and on which of those wavelengths are reflected off an object.
  • Although a human observer can distinguish between many thousands of wavelengths of light in the visible spectrum our brains often produce the impression of bands of colour.

Some key terms

Rainbow

A rainbow is an optical effect produced by illuminated droplets of water. Rainbows are caused by reflection, refraction and dispersion ...

When is the best time to see a rainbow?

Rainbows are at their best early morning and late afternoon when a shower has just passed over and the Sun ...

Wavelength

Wavelength is a measurement from any point on the path of a wave to the same point on its next ...

Electromagnetic spectrum

The electromagnetic spectrum includes electromagnetic waves with all possible wavelengths of electromagnetic radiation, ranging from low energy radio waves through ...

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