Q 21 :

If 917 $\mathrm{\AA }$ be the lowest wavelength of Lyman series then the lowest wavelength of Balmer series will be _________ $\mathrm{\AA }$.                [2023]

Q 22 :

A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit radiation of six different wavelengths. The frequency of incident light is $x\times {10}^{15}\mathrm{Hz}$. The value of $x$ is _______. (Given $h=4.25\times {10}^{-15}\mathrm{eV} \mathrm{s}$)                   [2023]

Q 23 :

An atom absorbs a photon of wavelength 500 nm and emits another photon of wavelength 600 nm. The net energy absorbed by the atom in this process is $n\times {10}^{-4}\mathrm{eV}$. The value of $n$ is ________.                  [2023]

[Assume the atom to be stationary during the absorption and emission process]

(Take $h=6.6\times {10}^{-34}\mathrm{Js}$ and $c=3\times {10}^8\mathrm{m}/\mathrm{s}$)                     

Q 24 :

As per given figure A, B and C are the first, second and third excited energy level of hydrogen atom respectively. If the ratio of the two wavelengths (i.e., $\frac{{\lambda }_1}{{\lambda }_2}$) is $\frac{7}{4n}$, then the value of $n$ will be _______.                [2023]

Q 25 :

The smallest wavelength of Lyman series is 91 nm. The difference between the largest wavelengths of Paschen and Balmer series is nearly ______ nm.       [2026]

• 1217

   

• 1550

   

• 1784

   

• 1875