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The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton (p), neutron (n) and alpha particle (α) is:
  1. epnα
  2. np, ,eα
  3. npα, e
  4. nαp, e


Solution

The correct option is D nαp, e
Charge/mass ratio is inversely proportional to the mass and hence electron with lightest mass has the greatest charge/mass ratio followed by protons, alpha particles and neutrons.

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