How Can Light Have No Mass Yet Transfer Energy?

[danielpherlio]

Ive been looking at the E = mc2 explained on youtube and apparently light has no mass how can it have no mass but you you can feel heat on your skin from light

 

[ModusPwnd]

Ive been looking at the E = mc2 explained on youtube and apparently light has no mass how can it have no mass but you you can feel heat on your skin from light

Why should feeling heat imply mass? That logic doesn't follow.

The equation you posted is for a massive particle at rest. Look up the full version of the equation for a clue on how to apply it to light.

 

[Nugatory]

Ive been looking at the E = mc2 explained on youtube and apparently light has no mass how can it have no mass but you you can feel heat on your skin from light

E = mc² applies only to things that have mass when they are at rest - and light is always moving with speed c, never at rest, so the equation doesn't apply. Instead, we have to use the more general equation:
E^2 = (m_{0}c^2)^2 + (pc)^2<br />

Here p is the momentum and m_0 is the "rest mass" of the object; when people say that light has no mass they mean that its rest mass is zero. Light does however carry momentum (p is non-zero) so there's still some energy to warm your skin.

 

[danielpherlio]

Thanks nugatory