A hydrogen atom has a radius of about 5 ? 10?9cm. The ra-dius of the observable universe is about 14 billion light-years. How many times larger than a hydrogen atom is the observ-able universe? Use powers-of-ten notation.
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14 billion light years = 1.325 × 10^28 cm
observable universe is larger than hydrogen atom = (1.325×10^28)/ 5 = 2.65 × 10^27 times bigger
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An f/10 telescope with a focal length of 3000 mm is used with an eyepiece of 2 mm focal length. What is the magnifying power of the system? Would the magnif i cation allow all the collected light to enter the pupil of the ey
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