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 difference of 2500V. The ratio of de-Broglie wavelength λBλA is
[Main 12 Jan. 2019 (I)]
(a) 10.00
(b) 0.07
(c) 14.14
(d) 4.47