The spectrum of electromagnetic waves ranges from low-frequency radio waves to high-frequency gamma
—© Merriam-Webster Inc.
What made you want to look up electromagnetic spectrum? Please tell us where you read or heard it (including the quote, if possible).
Take Our 10-Question Quiz
The commonly misspelled words quiz
How strong is your vocabulary?
The Vocab Quiz Game for iPhone & iPad
"Incredibly fun and addictive. And informative!" User Review, iTunes