The energy diagram of a hydrogen atom is given below. Arrange the wavelengths corresponding to different emissions in increasing order.
1
2
3
4
Official Solution
Correct Option: (4)
The energy levels of the hydrogen atom are depicted as follows:
- The energy difference between level D and A (13.6 eV to 0.85 eV) corresponds to the longest wavelength .
- The energy difference between levels C and A (3.4 eV to 0.85 eV) corresponds to .
- The energy difference between B and A (1.5 eV to 0.85 eV) corresponds to .
- The smallest energy difference corresponds to . Thus, the order of wavelengths from longest to shortest is: .
