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The photon does have mass. You can easily solve for it.

Energy of a photon is ( Planck's konstant times frequency).

But kinetic energy of any moving object is also ( 1/2 m V2 ).

For a photon, 'V' is 'c', so ( h f ) = (1/2 m c2) , and [ m = ( 2 x Planck's konstant x frequency) / c2 ] .

Or, what is equivalent, [ m = ( 2 x Planck's konstant ) / (wavelength x c) ] .

So, there's the mass of your photon, while it's moving at the speed of light ... which it always is.

What it doesn't have is rest mass ... mass that it would have if it were just laying there on the floor.

It can't have rest mass, because any rest mass becomes infinite when the object moves

at the speed of light.

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Q: How photon is an elementary particle despite having no mass?
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