In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and increase in frequency and energy, is known as a blueshift, or negative redshift.

Learn about and revise red-shift, the expanding Universe, the Big Bang theory and the future of the universe with GCSE Bitesize Physics.

As the light was shifted towards the red end of the spectrum (lower frequency/longer wavelength) this phenomenon was termed 'redshift'. The upper diagram shows the absorption spectrum from a...

Nov 3, 2024 · Learn about red shift for your IGCSE Physics exam. This revision note includes an explanation of red shift and how it provides evidence for an expanding universe

In this section, we will focus on just one application: we will learn how to measure the redshift of a galaxy from its spectrum, and we will learn how to interpret and use this number. An example will help to show how this works.

Jun 6, 2019 · Infographic titled “What is Cosmological Redshift?” explains cosmological redshift, or the stretching of light waves due to the expansion of space between galaxies, with text and diagrams. The infographic is divided into three parts with the following headers:

Mar 11, 2021 · Stretching over distance makes redshift one of the key tools for measuring the universe. Since astronomers can usually determine what wavelength they would see from up close, they can tell how far a galaxy is by how much the light has changed. Credit: NASA/JPL-Caltech//R. Hurt (Caltech-IPAC)

Dec 8, 2024 · Learn about red shift for your GCSE Physics exam. This revision note covers galactic red shift, the Doppler effect, and evidence for the expanding Universe.

This shift towards the red is called the Red Shift and is very good evidence for the expansion of the Universe and for the origin of the Universe in the Big Bang. If the Doppler shift of lines within their spectra can be measured their speed of recession can be calculated.

Learn about and revise red-shift, the expanding Universe, the Big Bang theory and the future of the Universe with GCSE Bitesize Physics.