What is the inertia of EM wave or field

Mathew Orman

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Reply to
admformeto
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Another useless link and a strong candidate for the title of King of Moronica

Reply to
paparios

The constant of the speed of light demonstrates its energy is not kinetic. As all light waves would be of the same colour if their energy were kinetic.

Mitchell Raemsch

Reply to
microm2011

There is no kinetic energy in light or EM wave as the fields are mass-less. The question is about inertia.

Mathew Orman

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Reply to
admformeto

Photons have momentum. Look it up.

John

Reply to
John Larkin

s.

There's energy associated with photons, and - as Einstein pointed out

- energy can be equated to mass. Photons may not have rest mass, but if they were resting they wouldn't exist.

And photons have momentum and thus inertia. The question is ill-posed.

-- Bill Sloman, Nijmegen

Reply to
Bill Sloman

That argument doesn't work for ball-bearings compared with bowling balls. Why should it work for photons?

-- Bill Sloman, Nijmegen

Reply to
Bill Sloman

Yes, so they must also have inertia.

Mathew Orman

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Reply to
admformeto

Then how much inertia a photon has?

Mathew Orman

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Reply to
admformeto

It's the "Dopeler Effect". The ideas sound better the faster they come at you. :)

Reply to
mpm

Why are we feeding the troll?

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My liberal friends think I'm a conservative kook.
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Reply to
Tim Wescott

They have momentum but zero mass, and only exist at one speed. I don't think it's meaningful to talk about their inertia.

John

Reply to
John Larkin

No, but we can talk about the permitivity and permeability of free space, which are properties that determine the EM velocity in free space, and hence can conceptually be viewed as an "inertia" (if we stretch things).

Reply to
Chris Richardson

s.

Inertia is perpetual motion. There is no absolute rest. It can be linear or circular.

Mitch Raemsch; the prize

Reply to
microm2011

--
Only at rest, so your argument is specious.
Reply to
John Fields

I have had one of these on my window sill since i was a kid..

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Mark

Reply to
Mark

Photons at rest? How do you manage that?

OK, what is the inertia of, say, a 500 nm photon? And what are the engineering units of same?

John

Reply to
John Larkin

But they spin backwards!

John

Reply to
John Larkin

EM waves don't have linear inertia but they do have "rotational inertia" AKA angular momentum.

Launching in only negative three days!

Mark L. Fergerson

Reply to
alien8752

"Let's not get started on radiometer's".. (fanning the flames.)

There's all this theory about holes in the vanes... but no real data!

Perhaps someone could write an NSF grant?

George H.

Reply to
George Herold

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