Concept based light and optics ?

[Chaosdealer]

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)

Homework Equations

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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!

 

[anathema]

I would like to clarify a few things before answering these questions. Firstly, the color of a gas when it is cool depends on the specific gas and its energy levels. Without knowing this information, it is impossible to determine the color of the gas. Secondly, the percentage of light reflected from a window also depends on various factors such as the angle of incidence, the type of glass used, and the surrounding environment. It is not accurate to give a single percentage without specifying these variables.

However, as a general answer, most gases appear colorless when cool as they do not have enough energy to emit visible light. As for the percentage of light reflected from a normal window, it can vary from 4-96% depending on the factors mentioned above. In most cases, the percentage is closer to 4% for a typical window with clear glass. I hope this helps clarify the questions.

 

[Moetasim]

I would like to clarify that the concept of light and optics is a broad and complex topic that encompasses various phenomena and principles. It involves the study of how light behaves, interacts with matter, and how it can be manipulated for various purposes.

Regarding the first question, the color of a heated gas depends on the element present and the temperature at which it is heated. Without this information, it is not possible to accurately determine the color of the gas when it is cool.

For the second question, the amount of light reflected from a normal window depends on various factors such as the angle of incidence, the type of glass used, and the surface properties of the glass. Additionally, the percentage of light reflected can vary depending on the wavelength of light. Therefore, it is not possible to give a definitive answer without specifying these parameters. However, in general, a normal window can reflect anywhere from 4-15% of incident light.