What is color? - Colm Kelleher

TL;DR

Light waves have frequencies that determine color, visible in the continuous spectrum; objects reflect certain colors.

Transcript

One of the most striking properties about life is that it has color. To understand the phenomenon of color, it helps to think about light as a wave. But, before we get to that, let's talk a little bit about waves in general. Imagine you're sitting on a boat on the ocean watching a cork bob up and down in the water. The first thing you notice about ... Read More

Key Insights

• 👋 Waves exhibit periodic motion, measured by frequency, characterized as up-and-down motion.
• 🙂 Color is a manifestation of the frequency of light waves, perceived as distinct hues.
• 🙂 Objects reflect certain light frequencies while absorbing others, influencing their perceived color.
• 🙂 The visible spectrum ranges from red to purple, encompassing all colors based on light frequencies.
• 🙂 Different colors of light are absorbed or reflected by objects, affecting their perceived color.
• 🙂 White objects reflect all colors of light, while black objects absorb all light frequencies.
• 🙂 The sun emits all colors of light, contributing to the varied colors we perceive in our surroundings.

Questions & Answers

Q: How do waves in general exhibit periodic motion?

Waves showcase repetitive motion, characterized by frequency, which is measured by how many times a wave completes its motion in one second.

Q: What determines the color we perceive from light?

The frequency of light waves determines color; our eyes interpret different frequencies as distinct colors along the visible spectrum.

Q: Why do objects appear colored?

Objects reflect specific light frequencies based on their color, while absorbing other frequencies which are converted into heat energy.

Q: Why does a yellow pencil look yellow?

A yellow pencil appears yellow as it reflects yellow light predominantly from the sun, absorbing other colored light frequencies.

Summary & Key Takeaways

• Waves exhibit periodic motion, measured by frequency; light waves have color frequencies.

• Color represents the frequency of light waves.

• Objects appear colored due to reflecting specific light frequencies and absorbing others.