3.氢原子从基态向n = 2激发态跃迁时,吸收光子的波长为λ1,频率为υ1;从n = 2激发态向n = 3激发态跃迁时,吸收光子的波长为λ2,频率为υ2;从n = 3激发态向基态跃迁时,放出光子的波长为λ3,频率为υ3,则