Wavelengths associated with an electron ($λ_e$), proton ($λ_p$), and deuteron ($λ_d$), all moving with the same speed.Using de Broglie’s equation: $λ = \;{h}/{mv}$• Since all particles have the same speed (v), their wavelengths are inversely proportional to their masses.• Electron has the smallest mass, so it has the longest wavelength.• Deuteron has the highest mass, so it has the shortest wavelength.Mass relation: $m_e < m_p< m_d$thus,wavelength relation: $λ_e > λ_p > λ _d$