Question

Red light has a longer wavelength and higher energy than blue light. True or False

Answer 1

Answer:

False

Explanation:

Visible light is composed of radiation of wavelengths between 400 and 700 nm. The sensitivity of the human eye depends on the wavelength and has a maximum at 550 nm. Some people are able to perceive from 380 to 780 nm.

The electromagnetic energy in a particular wavelength λ (in a vacuum) has an associated frequency f and a photonic energy E. Thus, the electromagnetic spectrum can be expressed in terms of any of these three variables, which are related by equations.

Thus, high frequency electromagnetic waves have a short wavelength and high energy; Low frequency waves have a long wavelength and low energy.

To calculate the energy of a photon the Planck formula is used is E = h · v, where E is the energy, h the Planck constant and v the frequency (Hz or s-1).  Where the frequency f is equal to the speed of the wave, divided by the wavelength λ .

That said we can say that it is false because although the red light has a longer wavelength than the blue one, in turn it has a lower energy than the blue light.