Both UVA and UVB radiation from the sun can damage the skin, together causing problems such as sunburn, premature aging and skin cancer. The Sun Protection Factor (SPF) rating of a sunscreen:
(40 points)
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If the sun is an average inflatable beach ball, about how large is the Earth?
(40 points)
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If the Sun suddenly transformed into a black hole of equivalent mass, what would happen to the planets in the Solar System?
(30 points)
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It takes about 500 seconds for light to reach Earth from the sun, but how long to go from the center of the Sun to the surface?
(40 points)
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