What is the de-Broglie wavelength of an electron accelerated by a potential difference of 100V? Find the ratio of de-Broglie wavelengths of an alpha particle and a proton having the same:
a) 3.27 x 10⁻¹⁰ m; 1:1
b) 6.54 x 10⁻¹⁰ m; 1:2
c) 1.23 x 10⁻⁹ m; 1:3
d) 2.46 x 10⁻⁹ m; 1:4