If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelengt — JEE Mains Chemistry Past Papers Chemistry Question

💡 Solution & Explanation

 1 = RH ×          2 1 n n × (Z)2 For Ist line of Paschen series : n1 = 3; n2 = 4 | JEE(Main) 2023 | DATE : 24-01-2023 (SHIFT-1) | PAPER-1 | CHEMISTRY PAGE # 9 1 = 1  = RH × (Z)2 ×          2 ) ( ) ( ....(1) 1 = 9  × RH × (Z)2 For IInd line of Paschen series : n1 = 3; n2 = 5 1  = RH × (Z)2 ×          2 ) ( ) ( ....(2) Dividing (1) by (2) 2  = 9  × 25 9 2 = 492 nm