Question

T or F. Einsteins famous E = mc2 says that even masses at rest have energy.

Answer 1

True. The full form is:
\[E^{2}=p^{2}c^{2}+(mc^{2})^{2}\]

When speed is 0, momentum p is 0. This means that even at rest masses have energy, which is given by mc^2, and often called rest mass.

Then mass is 0, then E = pc. This reduces to E=hf, which is the energy of particles of light which are called photons.

Answer 2

true

Answer 3

Thanks' :)