https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:waves/x1baed5db7c1bb50b:electromagnetic-waves/v/the-electromagnetic-spectrum 2025-07-01T10:10:08.145512912Z The electromagnetic spectrum Light is an electromagnetic wave. All electromagnetic waves travel at the speed of light in vacuum. The frequency of a light wave corresponds to its color. The amplitude of a light wave corresponds to its brightness. Visible light is only a small part of the electromagnetic spectrum, which also includes radio, microwaves, infrared, ultraviolet, X-rays, and gamma rays. These different frequencies of electromagnetic waves have different applications. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/e317d099-29e7-41b4-a05c-8f7178545f8b_1280_720_base.png The electromagnetic spectrum Light is an electromagnetic wave. All electromagnetic waves travel at the speed of light in vacuum. The frequency of a light wave corresponds to its color. The amplitude of a light wave corresponds to its brightness. Visible light is only a small part of the electromagnetic spectrum, which also includes radio, microwaves, infrared, ultraviolet, X-rays, and gamma rays. These different frequencies of electromagnetic waves have different applications. https://cdn.kastatic.org/ka-youtube-converted/iVbuCROYAz4.mp4/iVbuCROYAz4.mp4 523 Light https://www.khanacademy.org/science/ms-physics/x1baed5db7c1bb50b:waves/x1baed5db7c1bb50b:electromagnetic-waves/e/understand-absorption-and-reflection 2026-04-08T00:54:09.631945657Z Understand: electromagnetic waves Check your understanding of electromagnetic waves in this set of free, standards-aligned practice questions. Khan Academy exercise