3. Application of absorption and emission: a. What are important compounds/eleme

Question

3. Application of absorption and emission:

a. What are important compounds/elements/molecules to support a long-term human
presence on another planet or moon?

b. At what wavelengths would we look at to find unique signatures for each of those
listed above? Be as specific as possible.

If you place hydrogen gas between a white light and a prism, what colors (if any) do you
expect to see refracted by the prism.

ESS 102 - In Class Assignment 3 Due at the end of class April 28, 2015 1. Nuclear Reactions: Answer the following questions. a. What is the major difference between nuclear fission and nuclear fusion? [3 pts] b. What is the bvproduct of fission of25U that allows this reaction to be self- sustaining? [2 pts] c. Explain the term "half-life" in your own words. [5 pts] 2. Suppose a 50 kg chunk of highly radioactive material was left in an abandoned lab. The material's half-life is 8.1 days. Determine how much material is still radioactive after 6 months. Put your answer in grams. 1 Use the equation: N (t) = N (o) t1/2 where N(o) is the initial amount of material, t is the time elapsed, and t/2 is the half-life. [Hint, make sure the units of time are the same] [10 pts] 2 3. Application of absorption and emission: a. What are important compounds/elements/molecules to support a long-term human presence on another planet or moon? [10 pts] b. At what wavelengths would we look at to find unique signatures for each of those listed above? Be as specific as possible. [10 pts] Extra credit If you place hydrogen gas between a white light and a prism, what colors (if any) do you expect to see refracted by the prism. [2 pts]

Explanation / Answer

3. a. The provision of oxygen, water, and food, and protection from such inimical agents as radiation and temperature extremes.

b. The most efficient photosynthetic wavelengths are blue wavelengths measuring about 450 nanometers .

oxygen has a weak infrared spectral signature, and it will be very difficult to detect with the todays technology.

If you place hydrogen gas between a white light and a prism, what colors (if any) do you
expect to see refracted by the prism.

The light fanned out by the prism will show a continuoius spectrum from red to violet with dark lines appearing at the wavelengths corresponding to the bright lines in the emission spectrum.This type of spectrum is called an absorption spectrum.

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