A certain double plane window consist of two glass sheets each 80cm×80cm×0.30cm separated by a 0.30cm stagnant air space. The indoor temperature is 20​

Answerthe energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.explanationwe define electric potential as the ratio electric potential energy to the charge,    then the following gives us the potential difference,      the formula  may be on your formula sheet.the change in electric potential energy would be the energy that would needed to move it from point a to point b. solving for that, we get    using q = 8.00  × 10⁻¹⁹ c and  δv = 2.00 v, we get    the energy required is 1.60 × 10⁻¹⁸ j, to three significant figures.

Ithink the answer would be a 

Well it depends on the object or substance

+10 that is always the common denominator