If the mass of a proton is 1.67x${{10}^{-27}}$ kg

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#1

If the mass of a proton is 1.67x${{10}^{-27}}$ kg and if electron is found to be 1840 times lighter than hydrogen ion. Then find the charge to mass ratio of cathode rays.
[Given, charge on 1 electron = 1.6 x${{10}^{-19}}$ C]


#2