Charge on a proton is 1.6×10−19 C and its mass is calculated to be equal to 1.67×10−27 kg. Then e/m for proton is:
(e:Charge;m:Mass)
A
Less than e/m value for electron
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B
Equal to e/m value for electron
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C
Greater than e/m value for electron
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D
Equal to e/m value for neutron
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Solution
The correct option is A Less than e/m value for electron Charge on proton =1.6×10−19 C
Mass of proton =1.67×10−27 kg
Value of em=Magnitude of charge on protonMass of proton
=1.6×10−19 C1.67×10−27 kg
=0.958×108 C/kg
But e/m value of electron is 1.75×1011 C/kg which is greater than that of proton.