English

Explain Brackett series of spectral lines for the hydrogen atom. - Physics

Advertisements
Advertisements

Question

Explain Brackett series of spectral lines for the hydrogen atom.
Answer in Brief

Solution

  1. The spectral lines of this series corresponds to the transition of an electron from a higher energy state to the 4th orbit.
    For this series, p = 4 and n = 5, 6, 7, ....
  2. The wave numbers and the wavelengths of the spectral lines constituting the Bracket series are given by
    `barv = 1/lambda = R(1/4^2 - 1/n^2)`
    These series lie in the near infrared region of the spectrum.
shaalaa.com
Bohr’s Atomic Model
  Is there an error in this question or solution?
2017-2018 (March)

APPEARS IN

RELATED QUESTIONS

The radii of Bohr orbit are directly proportional to ______ 


What is the energy of an electron in a hydrogen atom for n = ∞?  


The linear momentum of the particle is 6.63 kg m/s. Calculate the de Broglie wavelength.


State Bohr's second postulate for the atomic model. Express it in its mathematical form.  


State any two limitations of Bohr’s model for the hydrogen atoms. 


Calculate the longest wavelength in the Paschen series.

(Given RH =1.097 ×107 m-1)  


Calculate the wavelength for the first three lines in the Paschen series. 
(Given RH =1.097 ×107 m-1)  


Calculate the shortest wavelength in the Paschen series if the longest wavelength in the Balmar series is 6563 Ao


Obtain an expression for wavenumber, when an electron jumps from a higher energy orbit to a lower energy orbit. Hence show that the shortest wavelength for the Balmar series is 4/RH.  


Which of the following series of transitions in the spectrum of hydrogen atom falls in ultraviolet region?


When the electron in hydrogen atom jumps from fourth Bohr orbit to second Bohr orbit, one gets the ______.


How many moles of electrons are required for reduction of 9 moles of Cr3+ to Cr?


In Bohr's model of hydrogen atom, the period of revolution of the electron in any orbit is proportional to ______.


For an electron, discrete energy levels are characterised by ____________.


The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to ____________.


Angular speed of an electron in the ground state of hydrogen atom is 4 × 1016 rad/s. What is its angular speed in 4th orbit?


Ratio of centripetal acceleration for an electron revolving in 3rd orbit to 5th orbit of hydrogen atom is ______.


An electron of mass 'm' is rotating in first Bohr orbit of radius 'r' in hydrogen atom. The orbital acceleration of the electron in first orbit (h = Planck's constant).


An electron makes a transition from an excited state to the ground state of a hydrogen like atom. Out of the following statements which one is correct?


Using Bohr's quantization condition, what is the rotational energy in the second orbit for a diatomic molecule. (I = moment of inertia of diatomic molecule, h = Planck's constant)


If Vn and Vp are orbital velocities in nth and pth orbit respectively, then the ratio Vp: Vn is ______.


The value of Rydberg constant in joule is ______.


Ultraviolet light of wavelength 300 nm and intensity 1.0 Wm−2 falls on the surface of a photosensitive material. If one percent of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly ______.


What is the origin of spectral lines? Obtain an expression for the wave number of a line in hydrogen spectrum.


Show that the angular speed of an electron in the nth Bohr orbit is w = `(πme^4)/(2ε_0^2h^3n^3)` and the corresponding frequency of the revolution of the electron is f = `(me^4)/(4ε_0^2h^3n^3)`.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×