Question

anyone can help me?
how albert eistein got the idea about e=mc^2?

Answer 1

Albert Einstein was famous for his theory of relativity and the resultant formula relating mass and energy; E = mc2. He was the winner of 1921 Nobel Prize in physics for his work on the photoelectric effect, which is also known as the Hertz effect.
He proposed a theory of relativity - which was the basis for a lot of new science.
i.e.

E= MC2

Where E is energy,
M is mass of the body,
C is the speed of light.
His ideas were from relativity.

Answer 2

Have a look at Einstein's original paper, which is quite short:
http://www.fourmilab.ch/etexts/einstein/E_mc2/www/