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प्रश्न
State three postulates of Bohr's theory of hydrogen atom.
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उत्तर
Neil Bohr's major three postulates about Bohr's model of the hydrogen atom are:
- Atoms contain a number of stable orbits in which electrons can live without producing energy; each orbit corresponds to a specific amount of energy.
- When an electron jumps from one orbit to another, there is an energy difference equal to E = nhν because the energy of the outer orbit is greater than the energy of the inner orbit.
- The angular momentum of the electron is quantized which can be shown as:
L = `(nh)/(2pi)`, where n = 1, 2, 3, ..........
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संबंधित प्रश्न
(i) State Bohr's quantization condition for defining stationary orbits. How does the de Broglie hypothesis explain the stationary orbits?
(ii) Find the relation between three wavelengths λ1, λ2 and λ3 from the energy-level diagram shown below.
Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nanosecond range. If the radiation source has a duration of 2 ns and the number of photons emitted during the pulse source is 2.5 × 1015, calculate the energy of the source.
The ratio of kinetic energy of an electron in Bohr’s orbit to its total energy in the same orbit is
(A) – 1
(B) 2
(C) 1/2
(D) – 0.5
A positive ion having just one electron ejects it if a photon of wavelength 228 Å or less is absorbed by it. Identify the ion.
Use Bohr’s model of hydrogen atom to obtain the relationship between the angular momentum and the magnetic moment of the revolving electron.
A particle has a mass of 0.002 kg and uncertainty in its velocity is 9.2 × 10−6 m/s, then uncertainty in position is ≥ ____________.
(h = 6.6 × 10−34 J s)
A 20% efficient bulb emits light of wavelength 4000 Å. If the power of the bulb is 1 W, the number of photons emitted per second is ______.
[Take, h = 6.6 × 10-34 J-s]
How much is the angular momentum of an electron when it is orbiting in the second Bohr orbit of hydrogen atom?
Calculate the radius of the second orbit of He+.
Energy and radius of first Bohr orbit of He+ and Li2+ are:
[Given RH = −2.18 × 10−18 J, a0 = 52.9 pm]
