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Albert Einstein's most famous equation is E=mc2E=mc2, where EE is the energy of an object (in joules), mm is the mass of an object (in kilograms), and cc is the speed of light (in meters per second). A hydrogen atom has 15.066×10−1115.066×10−11 joule of energy and a mass of 1.674 × 10−271.674 × 10−27 kilogram. What is the speed of light? Write your answer in scientific notation.

 May 4, 2016
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Well you have all of the ingredients to substitute into the equation and solve for c

 

15.066 x 10^-11  =  1.674 x 10^-27    c^2

 

sqrt ( 15.066 x 10^-11/1.674x10^-27) = c = sqrt (9 x 10^16) = 3.00 x 10^8  m/s

 May 4, 2016
edited by ElectricPavlov  May 4, 2016

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