Our Star, the Sun One hot experience.

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Presentation transcript:

Our Star, the Sun One hot experience

Our Sun The sun is more than 4.6 billion years old and will continue to burn for several billion more years. The sun, a star, is a collection of gas – mostly hydrogen and helium.

Sunlight Sunlight arrives in 3 forms: Infrared (heat) Visible light Ultraviolet light

Ultraviolet Light 3 classifications of UV light UVA = blacklight UVB = tanning, sunburn, cancer UVC = filtered out by the Earth’s atmosphere and never reaches us

Phosphors Phosphors are substances that give off light, or fluoresce, when exposed to light. Electrons energize the atoms in the substance to make them give off light

How do they Work? Tanning beds and Sun burns – overexposure to UVB rays mutates DNA and may start cancer

How do they Work? Sunscreens/Sunblock Sunscreens absorb UVB light Sunblocks block out UVB light

How do they Work? Bug Zapper – Bugs are attracted to the UVA light because they think it is food or because of mating. Mosquitos are not attracted. Why not?

How do they Work? Black Light Phosphor coating absorbs UVB, UVC and visible light. Only UVA is emitted

Uses for UV light Highlighters/stamp for readmission to theme parks Killing germs/sterilization

Uses for UV light Detect urine Detect insects CSI

Uses for UV light Detect counterfeit money Forgery (paintings, antiques)

Uses for UV light Tonic Water Detergents Detecting Minerals