Question

A certain particle carries $2.5 \times 10^{-16}$ C of static electric charge. Calculate the number of electrons present in it.

Answer 1

A sub atomic particle includes negative charge called electron and it present in the nucleus.

Total electrons  present in the particle is $2.5\quad \times \quad 1{ 0 }^{ -16 }C charge$

$z\quad =\quad \frac { Q }{ e } \\\\ z\quad =\quad \frac { 1 }{ 1.6022\quad \times \quad { 10 }^{ -19 }C } \times \quad (2.5\quad \times \quad 1{ 0 }^{ -16 }C)$

$=\quad 1.560\quad \times \quad 1{ 0 }^{ 3 }\\ \\Number\quad of\quad electrons,\quad z\quad =\quad 1560$