Concept based light and optics ?

Chaosdealer

1. The problem statement, all variables and given/known data

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. Relevant 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!