Question

1. 1 coulomb = 6.25 × 10¹⁸ electrons, 1 Joule = ……..eV

2. What is meant by 1 eV

3. Which is bigger unit J or eV? Justify for your answer.

Answer 1

1. lev =1.6 × 10^-19J

∴ 1J = \(\frac{1}{1.6\times10^{-19}}\)ev 1 J = 6.25 × 10¹⁸eV.

2. 1 ev is the energy acquired by an electron, when it is accelerated through a potential difference of one volt.

3. Joule is bigger unit, 1J = 6.25 × 10¹⁸eV.