The energy levels of an atom are shown in the figure. Which one of these transitions will result in the emission of a photon of wavelength 124.1 nm? Given \( h = 6.62 \times 10^{-34} \) Js.
The Bohr orbit radius for the hydrogen atom (\(n = 1\)) is approximately 0.530 \({Å}\). The radius for the first excited state (\(n = 2\)) orbit is (in \({Å}\)):
Select the figure from among the given Option that can replace the question mark (?) in the following series.
How many triangles are there in the following figure?