Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 27 - Early Quantum Theory and Models of the Atom - Questions: 20


The atoms in hydrogen gas at room temperature are almost all in the ground state of n=1.

Work Step by Step

When hydrogen gas is at room temperature, nearly all the H atoms are in the n=1 ground state. When a wide spectrum of light passes through the gas, photons are absorbed that are found in the Lyman series because these transitions involve electrons coming from or dropping to the n=1 ground state. Other series, containing photons that correspond to transitions between higher n states, are not absorbed because almost no atoms start in higher energy states.
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