Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
- The spectral lines of this series corresponds to the transition of an electron from some higher energy state to 2nd orbit.
- For Balmer series, p = 2 and n = 3, 4, 5. The wave numbers and the wavelengths of spectral lines constituting the Balmer series are given by.
`barv = 1/lambda = R(1/2^2 - 1/n^2)`
This series lies in the visible region.
APPEARS IN
संबंधित प्रश्न
If aO is the Bohr radius and n is the principal quantum number then, state the relation for the radius of nth orbit of the electron in terms of Bohr radius and principal quantum number.
State Bohr's second postulate for the atomic model. Express it in its mathematical form.
The angular momentum of an electron in the 3rd Bohr orbit of a Hydrogen atom is 3.165 × 10-34 kg m2/s. Calculate Plank’s constant h.
Derive an expression for the radius of the nth Bohr orbit for the hydrogen atom.
State the postulates of Bohr’s atomic model. Hence show the energy of electrons varies inversely to the square of the principal quantum number.
Using the expression for the radius of orbit for the Hydrogen atom, show that the linear speed varies inversely to the principal quantum number n the angular speed varies inversely to the cube of principal quantum number n.
The radius of electron's second stationary orbit in Bohr's atom is R. The radius of the third orbit will be ______
Using Bohr's model, the orbital period of electron in hydrogen atom in nth orbit is (ε0 = permittivity of free space, h = Planck's constant, m = mass of electron and e = electronic charge)
The ratio of the velocity of the electron in the first orbit to that in the second orbit is ____________.
Which of the following statements about the Bohr model of the hydrogen atom is FALSE?
How many moles of electrons are required for reduction of 9 moles of Cr3+ to Cr?
If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be ____________.
Taking the Bohr radius as a0= 53 pm, the radius of Li++ ion in its ground state, on the basis of Bohr's model, will be about ______.
In the nth orbit, the energy of an electron `"E"_"n"= -13.6/"n"^2"eV"` for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be ____________.
When hydrogen atom is in its first excited level, its radius is how many time its ground state radius?
If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's second postulate, the kinetic energy `"K.E." = 1/2"mv"^2` of the electron in C.G.S. system is 2 equal to ____________.
In hydrogen spectnun, the wavelengths of light emited in a series of spectral lines is given by the equation `1/lambda = "R"(1/3^2 - 1/"n"^2)`, where n = 4, 5, 6 .... And 'R' is Rydberg's constant.
Identify the series and wavelenth region.
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?
If a charge on the body is 1 nC, then how many electrons are present on the body?
If n is principal quantum number and r is the radius of the orbit in which electron revolves around nucleus, then its kinetic energy is ____________.
In hydrogen atom, during the transition of electron from nth outer orbit to first Bohr orbit, a photon of wavelength `lambda` is emitted. The value of 'n' is [R =Rydberg's constant] ____________.
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)
The 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 is ______.
(b =Planck's constant)
The momentum of an electron revolving in nth orbit is given by ______.
The value of Rydberg constant in joule is ______.
Calculate the energy of the electron in the ground state of the hydrogen atom. Express it in joule and in eV.
Calculate the radius of the first Bohr orbit in the hydrogen atom.
Compute the shortest and the longest wavelength in the Lyman series of hydrogen atom.
