VanCleave's Science Fun

Your Guide to Science Projects, Fun Experiments, and Science Research

  • Home
  • ASK JANICE
  • Teacher Guide
  • Homeschool Science For Kids

Spy Pen with Invisible Ink

By Janice VanCleave

teachersource.com

The spy pen contains ink that is invisible, which means that under ordinary lighting the ink does not reflect visible light to your eyes. Visible light is one of seven different types of light energy (also called electromagnetic energy) and is the only type of light that you can see. Visible light is a band […]

Filed Under: Light Tagged With: fluorescence

Fluorescence

By Janice VanCleave

Question: What causes some objects to glow under a black light? Black lights give off  Ultraviolet A light, which is a type of high-energy invisible light (radiation). Photons are packets of light energy. UV light photons have a higher energy than do the photons for visible light. Materials that glow under a black light contain […]

Filed Under: Physics Tagged With: EMR, fluorescence, luminescence, photoluminescence, photons, UV, visible light

Fluorescence vs. Photoluminescence

By Janice VanCleave

Fluorescence and Photoluminescence are types of luminescence (cold light) where the energy is supplied by EMR (electromagnetic radiation). EMR from most to least energetic are: gamma rays, x-rays, ultraviolet light, visible light, infrared light, microwaves,  and radio waves. The starting EMR energy source needed to produce visible light must be more energetic than visible light. […]

Filed Under: Physics Tagged With: fluorescence, photoluminescence

Topic Search

Visitors From All Over the World


Welcome to Janice’s Science Extravaganza!

The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

Copyright © 2025 · Janice Van Cleave · JVC's Science Fair Projects · Log in