Please help in answering the following three conceptual questions:
1. Explain why the absorption lines of an element have the same wavelengths as the emission lines of that element.
2. Why can't hydrogen fusion and helium fusion go on at the same time at the center of a star?
3. What evidence do we have that there is a relationship between sunspots and the temperature of the Earth?© BrainMass Inc. brainmass.com December 24, 2021, 9:54 pm ad1c9bdddf
SOLUTION This solution is FREE courtesy of BrainMass!
1. Absorption lines are produced from atoms absorbing photons and exciting electrons from a particular energy state to a higher energy state. Emission lines are produced from electrons falling back from an excited state to a less excited state. Thus, the wavelengths of both absorption and emission lines are completely determined by the energy levels of the atomic electrons. Corresponding to each photon absorption from state A to state B is an emission from state B to state A. Since the difference in energy levels is equal (and opposite), the corresponding wavelengths are the same.
2. Hydrogen and helium fusion involve different energies and therefore occur at different temperatures. Since the center of a star has a fixed temperature, these reactions cannot occur at the same time.
3. Data on sunspot numbers since 1600 have shown a strong correlation to the average temperature of the Earth during this period. In particular, the Maunder minimum, occurring around 1700, is a period marked by a low number of sunspots, while the modern maximum, occurring in recent years, is in part due to a high number of sunspots (also most likely in part due to the greenhouse effect).
Reference: http://en.wikipedia.org/wiki/Sunspots© BrainMass Inc. brainmass.com December 24, 2021, 9:54 pm ad1c9bdddf>