Total length of an orbital path of electron in nth state of atom should be in times (where n is an integer), the value of de-Broglie wavelength λ.. Thus, 2πτη = η λde. Class 12 Physics Chapter 12 Atoms Session ...
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Third excited state in hydrogen atom corresponds to n = 4. Hence maximum number of spectral lines, which can be emitted, is = n(n-1)/2 = 4(4-1)/2 = 6. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
Jonisation energy of an atom is defined as the energy required to remove an electron from its ground state energy level to its free state. Ionisation energy for a hydrogen atom is 13.6 eV. Class 12 Physics Chapter 12 Atoms ...
According to Bohr’s quantum condition, the angular momentum of an electron in its stationary (or stable) orbit should be an integer multiple of h/2π i.e., Ln = m vn.rn = n h/2π , where n is a positive integer.
The H line of Balmer series in emission spectrum of hydrogen atom corresponds to the transition from n₁ = 3 to nf = 2 orbit. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
Value of Rydberg’s constant for hydrogen is R = 1.097 × 10⁷ m⁻¹ . Class 12 Physics Chapter 12 Atoms Session 2024-2025.
The classical atom model of Rutherford could not explain the atomic structure because the atom was unstable on account of continuous emission of energy by the orbiting electron. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
Rutherford’s atom is an electrically neutral sphere consisting of a very small, massive and positively charged nucleus at the centre surrounded by revolving electrons in their respective orbits. The electrostatic force provides the requisite centripetal force. Class 12 Physics Chapter ...
Impact parameter (b) is the perpendicular distance of the velocity vector of the alpha-particle from the central line of nucleus, when the particle is far away from the nucleus. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
It is the distance from nucleus at which an energetic a-particles approaching directly towards the nucleus, retraces its path through 180°. At distance of closest approach speed of a-particle is zero. Class 12 Physics Chapter 12 Atoms Session 2024-2025.