if light does not have mass...


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Funmi Baruwa
Posts: 108
Joined: Wed Sep 30, 2020 9:50 pm

if light does not have mass...

Postby Funmi Baruwa » Mon Nov 30, 2020 8:54 am

This question may be asking to understand too much, but I'm a little curious.

If we use De Broglie's equation to find the wavelength/show the wavelike properties of a particle, then how come the equation was derived from equations used for light?

I thought light does not have mass, so how can we use light as a reference for an equation that requires mass??

I hope my question makes sense lol

Megan Sparrow 1A
Posts: 105
Joined: Wed Sep 30, 2020 9:49 pm
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Re: if light does not have mass...

Postby Megan Sparrow 1A » Mon Nov 30, 2020 10:05 am

You are correct, light does not have mass. It does, however, have momentum. Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum. This is why the DeBroglie equation works in this instance. Hope this helps!

Funmi Baruwa
Posts: 108
Joined: Wed Sep 30, 2020 9:50 pm

Re: if light does not have mass...

Postby Funmi Baruwa » Wed Dec 02, 2020 3:09 am

thanks!! that clears it up :)


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