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CBSE Class 12-science Answered

State Bohr's quantisation condition for defining stationary orbits. How does de broglie hypothesis explain the stationary orbits ???
Asked by pksunilnair | 02 Oct, 2017, 08:46: PM
answered-by-expert Expert Answer
Bohr’s quantization principle states that electrons revolve in a stationary orbit of which energy and momentum are fixed.
Momentum of an electron in the fixed orbit is given by nh/2𝜋,
where n is the principal quantum number.
De - Broglie interprets Bohr's 2nd postulate in terms of wave nature of the electron. 
Hence, a circular orbit can be taken to be a stationary energy state only if it contains an integral number of de-Broglie wavelengths.
Mathematically it is given as
begin mathsize 12px style 2 πr subscript straight n space equals space nh over mv therefore space mvr subscript straight n space equals space fraction numerator nh over denominator 2 straight pi end fraction end style
Answered by Yashvanti Jain | 03 Oct, 2017, 03:30: PM
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CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
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CBSE 12-science - Physics
consider a hypothesis H-like atom, the wavelength in Amstrong for the spectral lines for the transition from n=p to n=1 is given as  wavelength =1500p^2/p^2 -1 where p>1 find the minimum and maximum wavelength
Asked by Akshatkuma2004 | 04 Jul, 2021, 04:04: PM
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CBSE 12-science - Physics
Why emission spectra are seen in only those gases which have low density or low number of collisions?
Asked by rsrakesh932 | 12 Jun, 2020, 04:38: PM
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CBSE 12-science - Physics
How to obtain bright fringes by young double slit experiment. ??
Asked by yadavnitish688 | 14 Dec, 2019, 06:04: AM
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CBSE 12-science - Physics
What is the radius of an electron?
Asked by sidiz.shrestha07 | 26 May, 2019, 06:42: AM
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CBSE 12-science - Physics
THE VALUE OF GROUND  STATE ENERGY OF HYDROGEN ATOM IS -13.6eV WHAT DOES THE NEGATIVE SIGN SIGNIFY AND HOW MUCH ENERGY IS REQUIRED TO TAKE AN ELECTRON IN THIS ATOM FROM GROUND STATE TO THE FIRST EXCITED STATE ?
Asked by pardeepkumar2281 | 28 Feb, 2019, 07:24: PM
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CBSE 12-science - Physics
What is the order of velocity of an electron in H atom in ground state ?
Asked by pradeepjsme | 30 Jan, 2019, 03:54: PM
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CBSE 12-science - Physics
What is the order of velocity of an electron in a H-atom in ground state?
Asked by pradeepjsme | 30 Jan, 2019, 03:51: PM
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CBSE 12-science - Physics
Using de Boglie's hypothesis, explain with the help of a suitable diagram, Bohr's second postulate of quantisation of energy levels in a hydrogen atom.
Asked by rohitraman1115 | 14 Jan, 2019, 12:02: PM
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CBSE 12-science - Physics
The ground state energy of hydrogen atom is -13.6eV. What are the kinetic and potential energies of the electron in this state?
Asked by rohitraman1115 | 14 Jan, 2019, 12:01: PM
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