Question

What's the change in the orbit radius when the electron in hydrogen atom (Bohr's Model) undergoes first paschen B transition?

Answer 1

Atomic Hypothesis (Dalton) It assumed that – (i) an atom cannot be subdivided. (ii) atoms are neither created not destroyed during chemical reactions. (iii) atoms of the same element are alike; in particular all atoms of an element have the same mass. (iv) atoms of different elements are not alike; in particular, their masses are different. C2 Properties of Electron, Proton and Neutron Symbol Proton (p) Neutron (n) Electron (e) Mass 1.67252 × 10–27 kg 1.67482 × 10–27 kg 9.1091 × 10–31 kg Charge 1.60210 × 10–19 C 0 1.60210 × 10–19 C Mass relative to 1836 1839 1 the electron Charge relative +1 0 –1 to the proton Discovery Goldstein Chadwick Thomson C3 Some Sub-nuclear Particles Particle mass Charge Antiproton Same as that of proton Negative µ-meson (muon) 210 times that of an electron Positive and negative -meson 276 times that of an electron Positive and negative (pion) 265 times that of an electron Zero Neutrino Very much less than that of an Zero electron Positron Same as that of an electron Positive C4 Rutherford’s Nuclear Model of Atom (i) Rutherford’s scattering experiments disproved the Thomson model and led to the nuclear model of the atom in which positive charge is spread over a sphere of radius 10–15m, the so-called nucleus, and that the outer most electron clouds are about 10–10 m from the centre of the nucleus. (ii) The positive charge of a nucleus is due to the positively charged particles called protons. But mass of the nucleus is due to the protons and neutrons. (iii) The total number of protons and neutrons in a nucleus determine the nuclear mass. C5 Nature of Light and Electromagnetic Waves Wave theory consides light to be a form of wave motion of wavelength , related to frequency v and velocity of light c be equation   c v . Light waves are also considered electromagnetic in nature (i.e, they are oscillations of electric and magnetic fields in space). Various types of electromagnetic radiations having various wavelengths (or frequencies) are known and they constitute the so-called electromagnetic spectrum. By quantum theory put forward by planck E = nh =  nhc . where n is number of photons.
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