# Concept of De-Brogile Relation

**Question**

If travelling at same speeds, which of the following will have the

shortest wavelength?

(a) Electron

(b) Neutron

(c) Proton

(d) Alpha particle

**Solution**

According to de- broglie relation, the species with greatest mass

will have the shortest wavelength if they are travelling at same

speeds.

!! lambda = h/(mv)!!

Mass is inversely proportional to wavelength.

Therefore, Alpha particle being the heaviest will have the

shortest wavelength.