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Waves and Electromagnetic Radiation

  • Grade 11
  • Science
  • HS-PS4
  • Physical Science
  • Free lesson

Aligned to HS-PS4 — Next Generation Science Standards.

What this lesson teaches

Waves carry energy and are described by wavelength, frequency, and amplitude. The electromagnetic spectrum ranges from radio waves to gamma rays.

Worked examples

Example 1

Visible light is one part of the spectrum; radio waves have longer wavelengths and lower frequency, while X-rays have shorter wavelengths and higher energy.

Example 2

All of it travels at the same speed in a vacuum. A radio wave and a gamma ray leaving a star arrive together.

Example 3

Frequency and wavelength are locked: c = fλ. Doubling the frequency halves the wavelength, always.

Practice questions

  1. What three properties describe a wave?
  2. Order radio waves and X-rays by wavelength.
  3. How does frequency relate to energy in light?

Watch the lesson

Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.

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En español

Ondas y Radiación Electromagnética

Las ondas transportan energía y se describen por su longitud de onda, frecuencia y amplitud. El espectro electromagnético va desde las ondas de radio hasta los rayos gamma.

Ejemplo 1: La luz visible es una parte del espectro; las ondas de radio tienen longitudes de onda más largas y menor frecuencia, mientras que los rayos X tienen longitudes de onda más cortas y mayor energía.

Ejemplo 2: Todo viaja a la misma velocidad en el vacío. Una onda de radio y un rayo gamma que salen de una estrella llegan juntos.

Ejemplo 3: La frecuencia y la longitud de onda están ligadas: c = fλ. Duplicar la frecuencia reduce a la mitad la longitud de onda, siempre.

More Physical Science lessons

Newton's Laws and ForcesHS-PS2Energy Conservation and WorkHS-PS3

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