de Broglie wavelength

Two particles $\text{A}$‍ and $\text{B}$‍ are moving with the same momentum. The mass of $\text{A}$‍, $m_{\text{A}}$‍ is five times the mass of $\text{B}$‍, $m_{\text{B}}$‍.

The matter waves associated with $\text{A}$‍ and $\text{B}$‍ have wavelengths ${\lambda }_{\text{A}}$‍ and ${\lambda }_{\text{B}}$‍ respectively.