5.2 Waves and Wavelengths — How Your Brain Decodes Light and Sound Waves | Psychology 2e

This lesson covers Section 5.2 of OpenStax Psychology 2e, exploring the physical properties of waves — wavelength, frequency, and amplitude — and how they translate into the sensory experiences of color, brightness, pitch, and loudness. You'll see how the same wave geometry that governs light also governs sound, and just how narrow the slice of reality our senses actually detect. From the visible spectrum to the limits of human hearing, this section builds a clear picture of the physics behind perception. In this video: • Wavelength, frequency, and amplitude defined using an intuitive Slinky analogy • How light wavelength maps to color perception across the ROYGBIV visible spectrum (380–740 nm) • The electromagnetic spectrum and why humans can only see a tiny fraction of it — while honeybees see ultraviolet and snakes detect infrared • How sound wave frequency determines pitch and amplitude determines loudness, measured in decibels • Comparison of audible frequency ranges across species, from chickens to beluga whales (up to 123,000 Hz) • The danger of earbud listening at max volume (~100–105 dB) and noise-induced hearing loss after just 15 minutes • Timbre explained: why a piano and guitar sound different playing the same note at the same volume #OpenStax #Psychology #SensationAndPerception #Waves #IntroToPsychology OpenStax Content adapted from "OpenStax Psychology 2e", by OpenStax licensed under CC BY 4.0. Content based on Web Version: Apr 23, 2026. Read the textbook online https://openstax.org/details/books/psychology-2e Music first girl talking to me. by ikkun (ex. Barradeen) | https://soundcloud.com/ikkunwastaken Royalty Free Music by https://www.free-stock-music.com Creative Commons / Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en_US