why photons have zero rest mass? relativity

[@adissiusly]

Very easy explanation, thank you!

[@easyedu1]

Glad it was helpful!

[@mohammad1906]

Sir rest mass means mass at zero velocity, so how come did you put v=c as the particle will no longer be at rest??

[@taimoor69]

Because Photons can never ever be at rest position and that's the overall conclusion of this video

[@easyedu1]

Photons always in motion with speed of light

[@arifbaloch238]

Then why do we consider the rest mass term.Why it is so important to discuss, as when photons are always in motion.

[@hafizsakhawatali4619]

Why is the velocity not kept ZERO But c ???

[@easyedu1]

1. c is not kept zero we just replaced the v=c mean the particle is traveling with speed of liqt so its velocity v is equal to velocity of liqt. 2. if we keep the v=0 and not v=c the we will get underoot 1 and underoot 1 is equal to 1 so we will get m=m_0

[@cammus]

Please put subtitles

[@easyedu1]

ok

[@مهديمدلج-د4غ]

thank you شكرا لك

[@easyedu1]

you are most welcome

[@78tag]

I sure am glad I never had to glean anything from a lecture given by a man with this accent. I'm not trolling - it's just the truth.

[@MQasimKhan]

Nice job dear

[@easyedu1]

Thank you

[@devikashribhadri8422]

Thank you !

[@easyedu1]

You're welcome!

[@divyanshkaundal.369]

If the rest mass is zero than its relavistic mass should be zero....... But photons have relavistic mass.

[@easyedu1]

that mass is derived from debroglie hypothesis and from momentum. wavelength = h/p, photos are massless at rest but have momentum when in motion and they are always in motion

[@nevonachmani5879]

It’s not really the explanation for the reason that photons have zero mass… you’ve actually divided the expression by zero so you can’t just multiply it by zero… there is another explanation that it’s more physical…

[@easyedu1]

that's the explanation from relativity Einstein model using quantum mechanics you will be able to get mass using momentum term , it do have energy and momentum and momentum is we know mass time velocity, but that is a quantum explanation

[@margarita8987]

ehm what? You're talking too fast