Advertisements
Advertisements
प्रश्न
What is the nuclear radius of 125Fe, if that of 27Al is 3.6 fermi?
उत्तर
RAl = 3.6 fermi
RFe = ?
Radius of the Nucleus R = R0 A1/3
`"R"_("Fe")/"R"_("Al") = ("A"_("Fe")/"A"_("Al"))^(1/3)`
= `(125/27)^(1/3)`
RFe = `5/3` RAl
= `5/3 xx 3.6`
= 6 fermi
APPEARS IN
संबंधित प्रश्न
An atom has a nearly continuous mass distribution in a ____________ but has a highly non-uniform mass distribution in ____________.
(Thomson’s model/Rutherford’s model)
Answer the following question, which help you understand the difference between Thomson’s model and Rutherford’s model better.
Keeping other factors fixed, it is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?
Write two important limitations of Rutherford's nuclear model of the atom.
An electron in an atom revolves round the nucleus in an orbit of radius r with frequency v. Write the expression for the magnetic moment of the electron.
An alpha particle has
The Bohr model for the H-atom relies on the Coulomb’s law of electrostatics. Coulomb’s law has not directly been verified for very short distances of the order of angstroms. Supposing Coulomb’s law between two opposite charge + q1, –q2 is modified to |F| = `(q_1q_2)/((4πε_0)) 1/r^2, r ≥ R_0 = (q_1q_2)/(4πε_0) 1/R_0^2 (R_0/r)^ε, r ≤ R_0` Calculate in such a case, the ground state energy of a H-atom, if ε = 0.1, R0 = 1Å.
A narrow beam of protons, each having 4.1 MeV energy is approaching a sheet of lead (Z = 82). Calculate:
- the speed of a proton in the beam, and
- the distance of its closest approach
The energy of hydrogen atom in an orbit is −1.51 eV. What are the kinetic and potential energies of the electron in this orbit?
According to Bohr model, magnetic field at centre (at the nucleus) of a hydrogen atom due to motion of electron in the ninth orbit is proportional to:
Differentiate between the 'distance of the closest approach' and the 'impact parameter.'
