Explain the process of excitation, de-excitation, and ionization. 2. What are Lyman, Balmer, and Paschen series of a hydrogen atom? 3. What will be the wavelength of light emitted when in a hydrogen atom an electron jumps from n=5 to n=3 shell? What will be the name of this emission line? What type of telescope/spectroscope (UV, visible, or IR) will you need to observe and record this emission line? 4. You detected a strong Hβ emission line spectrum from your source toward the center of the Milky Way. What can you tell about the nature of the radiation source? 5. An electron in an excited state falls to the ground state by interaction with a free electron. Write the equation to represent this process. Will any photon be emitted in this case? Why or why not? 6. What is optical depth? What happens if a medium is optically think? Optically thin? 7. Using the radiative transfer equation of a simple slab-like absorbing medium with no internal emission source, I = I0 exp(−n σ x), where I0 is the original photon flux, σ is the absorption cross section, n is the particle number density of medium, and x is the path length through the medium. 7a) What is the formula to calculate τ in terms of quantities that are provided above? 7b) What fraction of the original photon flux would be absorbed by the medium of τ = 5? Please answer ALL questions, preferably typed. Thank you! -xoxo.
1. Explain the process of excitation, de-excitation, and ionization.
2. What are Lyman, Balmer, and Paschen series of a hydrogen atom?
3. What will be the
4. You detected a strong Hβ emission line spectrum from your source toward the center of the Milky Way. What can you tell about the nature of the
5. An electron in an excited state falls to the ground state by interaction with a free electron. Write the equation to represent this process. Will any photon be emitted in this case? Why or why not?
6. What is optical depth? What happens if a medium is optically think? Optically thin?
7. Using the radiative transfer equation of a simple slab-like absorbing medium with no internal emission source, I = I0 exp(−n σ x), where I0 is the original photon flux, σ is the absorption cross section, n is the particle number density of medium, and x is the path length through the medium.
7a) What is the formula to calculate τ in terms of quantities that are provided above?
7b) What fraction of the original photon flux would be absorbed by the medium of τ = 5?
Please answer ALL questions, preferably typed. Thank you! -xoxo.
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