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Question

A hypothetical sub-atomic particle has a mass 49.1 times of an electron and a charge equal to that of a proton. Calculate the charge to mass ratio.
  1. 0.4×1012 C kg1
  2. 1.2×1012 C kg1
  3. 0.8×1010 C kg1
  4. 0.4×1010 C kg1


Solution

The correct option is A 0.4×1012 C kg1
Given,
Mass of the particle=4 × mass of electron (me)9.1=4me9.1

Charge of the particle=+e

Charge to mass ratio=e4me9.1=9.1×1.6×1019 C4×9.1×1031 kg=0.4×1012 C kg1

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