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!