Dual Nature Of Light Question 187

Question: A particle A of mass ’m’ and charge ‘q’ is accelerated by a potential difference of 50v another particle B of mass ‘4m’ and charge ‘q’ is accelerated by a potential differnce of 2500V. The ratio of de - Broglie wavelength $ \frac{{\lambda_{A}}}{{\lambda_{B}}} $ is

Solution:

Answer: 14.14