CBSE Class 12-science Physics Bohr's Model of Atom
- 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?
- 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
- Why emission spectra are seen in only those gases which have low density or low number of collisions?
- How to obtain bright fringes by young double slit experiment. ??
- What is the radius of an electron?
- 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 ?
- What is the order of velocity of an electron in H atom in ground state ?
- What is the order of velocity of an electron in a H-atom in ground state?
- 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.
- The ground state energy of hydrogen atom is -13.6eV. What are the kinetic and potential energies of the electron in this state?