* Isaac Newton (1642-1727) believed light consisted of particles * By 1900 most scientists believed that light behaved as a wave.

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Presentation transcript:

* Isaac Newton ( ) believed light consisted of particles * By 1900 most scientists believed that light behaved as a wave.

Visible light is a small portion of electromagnetic spectrum. This is the only part of this energy range that our eyes can detect. What we see is a rainbow of colors. R ed O range Y ellow G reen B lue I ndigo V iolet ROY G BIV

The radiation to which our eyes are most sensitive has a wavelength near the middle of this range, at about 5.5 x m (550 nm), in the yellow- green region of the spectrum.

It is no coincidence that this wavelength falls within the range of wavelengths at which the Sun emits most of its electromagnetic energy—our eyes have evolved to take greatest advantage of the available light.

The electromagnetic spectrum represents the range of energy from low energy, low frequency radio waves with long wavelengths up to high energy, high frequency gamma waves with small wavelengths.

* Frequency means the number of waves that past through a certain space during a certain time * Radio waves have a low Frequency will Gamma rays have a high frequency