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1. Calculate the difference in energy between the second and third lines in the Paschen series...

1. Calculate the difference in energy between the second and third lines in the Paschen series ofhydrogen’s emission spectrum.

2. The half-life of americium-243 is7.37×103years. If there were5.555×1024atoms of americi-um-243 on earth at year zero(0BCE=0CE,or0BC=0ADifyouprefer), how many are lefttoday?

3.Calculate the approximate density of the unstable americium-243 nucleus.

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