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Concept based light and optics ?

1. Homework Statement

When a gas is heated, it emits red and green light. What is its color when it is cool?

What % of light is reflected from a normal window? (answer choices 0, 20, 50 and 100)

2. Homework Equations

???

3. The Attempt at a Solution

For the first question, I can't think of any answer without knowing the element (it's not given).

For the second question, I want to say 0% if it is 90 degrees to the window...but I'm clueless.

Thanks for the help!
 

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