This is absorption, and each element’s electrons absorb light at specific wavelengths (i.e., energies) related to the difference between energy levels in that atom.

Falling energy levels in galaxies mean the Universe is ... to measure the energy output of over 200,000 galaxies across as broad a wavelength range as possible," said Professor Simon Driver ...

Each color in the visible light spectrum has a different wavelength and energy level. Blue light has shorter wavelengths and higher energy than other colors. Some research shows a link between eye ...

Without this advancement in wavelength conversion, noted the authors, it would have required 100 times the optical power level to achieve the same terahertz waves, which the thin optical fibers ...

For context, one of those visible wavelengths carries an energy of about 1 electron volt. The gamma rays Nisa and fellow researchers witnessed, by contrast, exuded about 1 trillion electron volts ...