An electron is travelling with a velocity v in free space and when it enters a medium, its velocity is reduced by 20%. T…

An electron is travelling with a velocity v in free space and when it enters a medium, its velocity is reduced by 20%. The de Broglie wavelength of electron in the medium is \(\alpha {\lambda }_{0}\) , where \({\lambda }_{0}\) is its de Broglie wavelength in free space. The value of \(\alpha\) is______.

[JEE Main 2026, 5 Apr (Shift 2)]