JEE Main 2026 Physics question

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 αλ₀, where λ₀ is its de Broglie wavelength in free space. The value of α is .

• (A)1.20
• (B)1.0
• (C)1.25Correct
• (D)0.75