Which statement correctly explains why the spectral lines of the Paschen series…
CHEMISTRY · Single correct · CBSE · Chemistry · Structure of Atom · Structure of Atom
Problem
Which statement correctly explains why the spectral lines of the Paschen series appear in the infrared region of the electromagnetic spectrum?
(a) The value of the Rydberg constant for transitions terminating at nf=3 is effectively smaller, automatically moving the wavelengths into the infrared.
(b) Electrons fall only a few levels (at most three) before stopping at nf=3, so they release little energy and the emitted photons have long infrared wavelengths.
(c) The energy difference between levels that end at nf=3 is smaller than that for nf=2, so the photons produced have lower frequency and longer wavelength, placing them in the infrared.
(d) Because the electrons start from very high initial levels, many students think they release more energy, and that larger energy somehow produces the longer-wavelength infrared photons.