Single Choice

Determine $$e/m$$ value for proton (e = charge, m = mass):

ALess than $$e/m$$ value of electron
Correct Answer
BEqual to $$e/m$$ value of electron
CGreater than $$e/m$$ value of electron
DAll the above

Solution

The magnitude of charge is same for both proton and electron.

The mass of a proton is about $$1850$$ times the mass of an electron.

As a proton has mass very much greater than the mass of an electron, the ratio $$\dfrac{e}{m}$$ for a proton will be smaller than the corresponding value for an electron.

In fact, $$\dfrac{e}{m}$$ for an electron will be approximately $$1850$$ times the $$\dfrac{e}{m}$$ for a proton.

Option A is correct.

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