Question

The ratio of specific charges of an electron to that of a hydrogen ion is ?

• A. $2:1$
• B. $1:1$
• C. $1:1840$
• D. $1840:1$

Answer 1

The correct option is D $1840:1$

Hydrogen ion has charge $+e$ and mass equal to mass of protn $m_p$ which is equal to $1840m_e$

where $m_e$ is mass of electron.

So value of specific charge for hydrogen ion will be $\frac{e}{1840m_e}$

While for electron it is $\frac{e}{m_e}$

So required ratio is $1840:1$

Option D is correct.