The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H=2.18 ×10⁻¹⁸J atom⁻¹ and h = 6.625 × 10⁻³⁴ J s )
a)1.54 x 10¹⁵ s⁻¹
b)1.03 x 10¹⁵ s⁻¹
c)3.08 x 10¹⁵ s⁻¹
d)2.00 x 10¹⁵ s⁻¹