Question

The e/m value of a proton is:

• A. Greater than e/m value of an electron.
• B. Less than e/m value of an electron.
• C. Equal to e/m value of an electron
• D. Depends on element

Answer 1

The correct option is B Less than e/m value of an electron.

We know that magnitude of charge is the same for a proton and an electron but the mass of an electron is less than that of the mass of a proton.
$M_e=9.1\times {10}^{-31}kg$
and $M_e=1.67\times {10}^{-27}kg$
So, the value of $\frac{e}{m}$will be greater for an electron