Which electromagnetic radiation has the lowest frequency?

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Explore Alberta's Grade 8 Science curriculum on Light and Optical Systems. Test your knowledge with engaging quizzes including flashcards and multiple choice questions. Prepare effectively for your exam!

Multiple Choice

Which electromagnetic radiation has the lowest frequency?

Explanation:
This question looks at where different kinds of electromagnetic radiation sit on the frequency scale. All electromagnetic waves travel at the same speed in a vacuum, so their frequency and wavelength are inversely related: f = c/λ. That means longer wavelengths mean lower frequencies. Radio waves have the longest wavelengths among these options, so they have the smallest frequency. Ultraviolet rays, X‑rays, and gamma rays each have shorter wavelengths and higher frequencies in that order, with gamma rays having the highest frequency. So radio waves are the lowest-frequency type listed.

This question looks at where different kinds of electromagnetic radiation sit on the frequency scale. All electromagnetic waves travel at the same speed in a vacuum, so their frequency and wavelength are inversely related: f = c/λ. That means longer wavelengths mean lower frequencies.

Radio waves have the longest wavelengths among these options, so they have the smallest frequency. Ultraviolet rays, X‑rays, and gamma rays each have shorter wavelengths and higher frequencies in that order, with gamma rays having the highest frequency. So radio waves are the lowest-frequency type listed.

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