MHT CET202123 Sep 2021Evening ShiftPhysicsAtomic PhysicsActual
The shortest wavelength for Lyman series is 912 Å . The longest wavelength in Paschen series is
Options
- A1216 Å
- B3646 Å
- C18760 Å
- D8208 Å
Correct answer
C. 18760 Å
Step-by-step solution
Shortest wavelength in Lyman series is given by aligned & 1 _ I = R [ 1 1^2 - 1 ]= R & _ I = 1 R aligned The longest wavelength in Paschen series is given by aligned & 1 _ p = R [ 1 (3)^2 - 1 (4)^2 ] & = R [ 1 9 - 1 16 ]= R 7 144 & _ p = 144 7 R & _ p _ L = 144 7 R = 144 7 & _ p = 144 7 R _ L = 144 7 912=18760 Å aligned