The ratio of minimum wavelength of Lyman and Balmer series will be

Step-by-step solution

We know that, wavelength of hydrogen spectrum is given by 1 =R ( 1 n₁² - 1 n₂² ) For minimum wavelength of Lyman series, aligned & n₁=1 and n₂= & 1 ( _ L )_ =R ( 1 (1)² - 1 )=R ( ₂ )_ = 1 R aligned For minimum wavelength of Balmer series, n₁=2 and n₂= 1 ( _ B )_ =R ( 1 2² - 1 )=R ( 1 4 -0 )= R 4 ( _ B )_ = 4 R ( _ L )_ ( _ B )_ = 1 R 4 R = 1 4 =0.25