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34 votes
34 votes
1. What makes a "fluorescent" highlighter marker so bright?

2. How does plasma make a campfire flame orange?

3. Why are crystals rare?

User Curtis Blackwell
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2.8k points

2 Answers

14 votes
14 votes

Answer:

1: When light of a certain wavelength is directed at the molecule's chromophore, a photon is absorbed and excites an electron to a higher energy state. Fluorescent highlighter ink is unusually bright because it converts some of the incident ultraviolet light that is invisible to humans into visible light.

2: The de-excitation of plasma (charged gas) is not the source of the light given off by a campfire's flame. The incandescence of solid soot particles billowing up on an updraft of hot air is what creates the light seen as a flame.

3: erosion and mixed composition. Wind, rain, and water flow have a way of knocking and mixing around things here on earth. This erosion causes big crystals such as a palm-sized amethyst to get knocked apart into little crystals.

User Nathaniel Saxe
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2.6k points
12 votes
12 votes

Answer:

1. What makes a "fluorescent" highlighter marker so bright?

When light of a certain wavelength is directed at the molecule's chromophore, a photon is absorbed and excites an electron to a higher energy state. Fluorescent highlighter ink is unusually bright because it converts some of the incident ultraviolet light that is invisible to humans into visible light.

2. How does plasma make a campfire flame orange?

The de-excitation of plasma (charged gas) is not the source of the light given off by a campfire's flame. The incandescence of solid soot particles billowing up on an updraft of hot air is what creates the light seen as a flame.

3. Why are crystals rare?

The answer is twofold: erosion and mixed composition. Wind, rain, and water flow have a way of knocking and mixing around things here on earth

User PrincelySid
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2.8k points