Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: taregg on 30/10/2013 12:56:51

Title: Which electromagnetic wavelength has more energy, and which has more power?
Post by: taregg on 30/10/2013 12:56:51

which electromagnetic has more energy and the other has more power.........for long waves and short waves  ..

Title: Re: which electromagnetic has more energy and the other has more power.........
Post by: JP on 30/10/2013 16:00:42

For each photon, the energy is proportional to 1/wavelength, so short waves have higher energy photons.  The power delivered by a wave depends on how many photons it transmits per second, which can vary.  A low wavelength wave with many photons/second can deliver more energy than a high wavelength wave with only a small number of photons/second.

Title: Re: which electromagnetic has more energy and the other has more power.........
Post by: taregg on 30/10/2013 22:02:08

like if we have ultraviolt laser and microwave laser.....which one has more power....if ultraviolt has short wave and microwave has long wave..

Title: Re: which electromagnetic has more energy and the other has more power.........
Post by: JP on 30/10/2013 23:22:02

Lasers, like light bulbs in your house, can run at different powers.  A 10 mW microwave laser has the same power as a 10 mW ultraviolet laser.

Title: Re: which electromagnetic has more energy and the other has more power.........
Post by: Kryptid on 01/11/2013 20:29:32

JP already answered your question: it varies from one laser to another, regardless of wavelength.

Title: Re: which electromagnetic has more energy and the other has more power.........
Post by: evan_au on 01/11/2013 20:52:58

A photon with long wavelength carries less energy than a photon with short wavelength.

Two lasers with the same optical power will deliver the same amount of energy every second, but the one with longer wavelength delivers more photons per second, so the total energy is the same.