# ______ has the highest mobility.

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______ has the highest mobility.
1. Ions
2. Electrons
3. Neutron
4. Proton

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Correct Answer - Option 2 : Electrons

CONCEPT:

Mobility (μ): It is defined as drift velocity per unit electric field applied i.e.,

$\mu = \frac{{{v_d}}}{E} = \frac{{q\tau }}{m}$

Where τ = average relaxation time, m = mass of charge particle and q = charge on a charged particle.

EXPLANATION:

• The effective mass of electrons is 9.11 × 10-31 kg.
• Holes being present in the valence band are closer to the nuclei and experience more attractive force and hence have a higher effective mass.
• So, the mobility of free electrons is higher than that of holes because electrons are lighter