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Mark wants to know:Since the Universe is expanding and light stretches across it as it does so becoming more red, what happens to the lost energy when the shorter wavelength, higher energy light towards the blue end of the spectrum is shifted into lower energy red wavelengths?Do you know the answer?
450nm has the same energy has 750nm
Quote from: Black hole on 15/10/2021 21:03:17450nm has the same energy has 750nmNo, it doesn't. A photon with a wavelength of 450 nanometers has (750 nm/450 nm = ~1.67) times as much energy as a photon with a wavelength of 750 nanometers.
Have you ever stretched an elastic band ?
Quote from: Black hole on 15/10/2021 21:48:16Have you ever stretched an elastic band ?Photons are not elastic bands.
The point is if you shun a beam of blue light on an object for example 1 second, the shorter wave length , a red light beam would deliver the same amount of energy but it would take nanoseconds longer because of the longer wave .Consider this example as pulses of light rather than a constant beam .
Quote from: Black hole on 15/10/2021 23:59:59The point is if you shun a beam of blue light on an object for example 1 second, the shorter wave length , a red light beam would deliver the same amount of energy but it would take nanoseconds longer because of the longer wave .Consider this example as pulses of light rather than a constant beam .What do you mean by "shun"?A photon with a shorter wavelength has more energy than a photon with a longer wavelength. That is a fact. The energy of a photon is given by E = hf, where "f" is the frequency. Since all light travels at the same speed in a vacuum, frequency is inversely proportional to wavelength.
As I explained already =If you are stretching anything by force , the energy is divided but remains the same value .You are talking about magnitude as opposed quantity!