Answer
Verified
40.8k+ views
Rydberg constant describes the wavelengths or frequencies of light in various series of related spectral lines, mainly those emitted by hydrogen atoms in the Balmer series.
Complete step-by-step answer:
We know,
The wavelength of an electron is represented by $\text{ }\!\!\lambda\!\!\text{ }$
${{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}$ is the orbit number which is 2 in this case
${{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}$ is \[\infty \] because the destination orbit number is undefined
\[\dfrac{\text{1}}{\text{ }\!\!\lambda\!\!\text{ }}\text{=R}\left( \dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}^{\text{2}}}-\dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}^{\text{2}}} \right)\]
Where R is Rydberg constant.
\[\Rightarrow \dfrac{\text{hc}}{\text{ }\!\!\lambda\!\!\text{ }}\text{=hcR}\left( \dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}^{\text{2}}}-\dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}^{\text{2}}} \right)\]
\[\Rightarrow \Delta \text{E=hcR}\left( \dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}^{\text{2}}}-\dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}^{\text{2}}} \right)\]
Given,
$\text{E = }-\text{3}\text{.4eV}$
So,
$\Delta \text{E = 0}-(-\text{3}\text{.4eV})$
$=\text{ 3}\text{.4eV = 3}\text{.4}\times \text{1}\text{.6}\times \text{1}{{\text{0}}^{-19}}$
$=\text{ 5}\text{.44}\times \text{1}{{\text{0}}^{-19}}\text{ J}$
Where,
$\text{h = 6}\text{.63}\times \text{1}{{\text{0}}^{-34}}\text{ }{{\text{m}}^{2}}\text{kg/s}$
$\text{c = 3}\times \text{1}{{\text{0}}^{8}}\text{ m/s}$
So,
$5.44\times {{10}^{-19}}\text{ = }\dfrac{\text{R}\times \text{6}\text{.63}\times \text{1}{{\text{0}}^{-34}}\times 3\times {{10}^{8}}}{4}$
$\Rightarrow \text{R = 1}\text{.09}\times \text{1}{{\text{0}}^{6}}\text{ }{{\text{m}}^{-1}}$
Therefore, the value of Rydberg’s constant is $\text{1}\text{.09}\times \text{1}{{\text{0}}^{6}}\text{ }{{\text{m}}^{-1}}$ if the energy of electron in the second orbit of hydrogen atom is -3.4eV.
Note: We should have knowledge about the Rydberg’s constant.
1) In spectroscopy, the Rydberg constant, symbol for heavy atoms or for hydrogen, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to the electromagnetic spectrum of an atom.
2) When used in this form in the mathematical description of a series of spectral lines, the result is the number of waves per unit length, of the week numbers. Multiplication by the speed of light yields the frequencies of the spectral lines.
3) Kinetic and potential energy of atoms results from the motion of electrons. When the electrons are excited they move to a higher energy orbital farther away from the atom. The further the orbital from the nucleus, the higher the potential energy of the electron at the energy level.
Complete step-by-step answer:
We know,
The wavelength of an electron is represented by $\text{ }\!\!\lambda\!\!\text{ }$
${{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}$ is the orbit number which is 2 in this case
${{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}$ is \[\infty \] because the destination orbit number is undefined
\[\dfrac{\text{1}}{\text{ }\!\!\lambda\!\!\text{ }}\text{=R}\left( \dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}^{\text{2}}}-\dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}^{\text{2}}} \right)\]
Where R is Rydberg constant.
\[\Rightarrow \dfrac{\text{hc}}{\text{ }\!\!\lambda\!\!\text{ }}\text{=hcR}\left( \dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}^{\text{2}}}-\dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}^{\text{2}}} \right)\]
\[\Rightarrow \Delta \text{E=hcR}\left( \dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{1}}}^{\text{2}}}-\dfrac{\text{1}}{{{\text{ }\!\!\eta\!\!\text{ }}_{\text{2}}}^{\text{2}}} \right)\]
Given,
$\text{E = }-\text{3}\text{.4eV}$
So,
$\Delta \text{E = 0}-(-\text{3}\text{.4eV})$
$=\text{ 3}\text{.4eV = 3}\text{.4}\times \text{1}\text{.6}\times \text{1}{{\text{0}}^{-19}}$
$=\text{ 5}\text{.44}\times \text{1}{{\text{0}}^{-19}}\text{ J}$
Where,
$\text{h = 6}\text{.63}\times \text{1}{{\text{0}}^{-34}}\text{ }{{\text{m}}^{2}}\text{kg/s}$
$\text{c = 3}\times \text{1}{{\text{0}}^{8}}\text{ m/s}$
So,
$5.44\times {{10}^{-19}}\text{ = }\dfrac{\text{R}\times \text{6}\text{.63}\times \text{1}{{\text{0}}^{-34}}\times 3\times {{10}^{8}}}{4}$
$\Rightarrow \text{R = 1}\text{.09}\times \text{1}{{\text{0}}^{6}}\text{ }{{\text{m}}^{-1}}$
Therefore, the value of Rydberg’s constant is $\text{1}\text{.09}\times \text{1}{{\text{0}}^{6}}\text{ }{{\text{m}}^{-1}}$ if the energy of electron in the second orbit of hydrogen atom is -3.4eV.
Note: We should have knowledge about the Rydberg’s constant.
1) In spectroscopy, the Rydberg constant, symbol for heavy atoms or for hydrogen, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to the electromagnetic spectrum of an atom.
2) When used in this form in the mathematical description of a series of spectral lines, the result is the number of waves per unit length, of the week numbers. Multiplication by the speed of light yields the frequencies of the spectral lines.
3) Kinetic and potential energy of atoms results from the motion of electrons. When the electrons are excited they move to a higher energy orbital farther away from the atom. The further the orbital from the nucleus, the higher the potential energy of the electron at the energy level.
Recently Updated Pages
silver wire has diameter 04mm and resistivity 16 times class 12 physics JEE_Main
A parallel plate capacitor has a capacitance C When class 12 physics JEE_Main
A series combination of n1 capacitors each of value class 12 physics JEE_Main
When propyne is treated with aqueous H2SO4 in presence class 12 chemistry JEE_Main
Which of the following is not true in the case of motion class 12 physics JEE_Main
The length of a potentiometer wire is 10m The distance class 12 physics JEE_MAIN
Other Pages
A closed organ pipe and an open organ pipe are tuned class 11 physics JEE_Main
Which of the following figures represent the variation class 12 physics JEE_Main
The mole fraction of the solute in a 1 molal aqueous class 11 chemistry JEE_Main
A food packet is dropped from a helicopter rising up class 11 physics JEE_Main
In an electromagnetic wave A Power is equally transferred class 12 physics JEE_Main
Amongst LiCl RbCl BeCl2 and MgCl2the compounds with class 11 chemistry JEE_Main