Advertisements
Advertisements
Question
Thorium 90Th232 is disintegrated into lead 82Pb200. Find the number of α and β particles emitted in disintegration.
Advertisements
Solution
When an α-particle is emitted by an atom, its atomic number decreases by 2 and mass number decreases by 4.
When 90Th232 disintegrates to 82Pb200, 8 α particles are emitted.
When a β-particle is radiated, the atomic number increases by 1 and mass number does not change.
When 90Th232 disintegrates to 82Pb200, 8 β particles are emitted.
APPEARS IN
RELATED QUESTIONS
Using Rutherford's model of the atom, derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron?
In the ground state of ______ electrons are in stable equilibrium, while in ______ electrons always experience a net force.
A classical atom based on ______ is doomed to collapse.
An atom has a nearly continuous mass distribution in a ______ but has a highly non-uniform mass distribution in ______.
Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?
In a Geiger-Marsden experiment, calculate the distance of closest approach to the nucleus of Z = 75, when a α-particle of 5 MeV energy impinges on it before it comes momentarily to rest and reverses its direction.
How will the distance of closest approach be affected when the kinetic energy of the α-particle is doubles?
The total energy of an electron in the ground state of the hydrogen atom is -13·6 eV. Its total energy, when a hydrogen atom is in the first excited state, is ______.
Answer the following question.
A charged particle q is moving in the presence of a magnetic field B which is inclined to an angle 30° with the direction of the motion of the particle. Draw the trajectory followed by the particle in the presence of the field and explain how the particle describes this path.
Answer the following question.
Explain briefly how Rutherford scattering of α-particle by a target nucleus can provide information on the size of the nucleus.
Alpha particles used in Geiger-Marsden experiment were obtained from ______.
The first line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from ______.
In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first is:
Plutonium decays with half of 24000 years. If plutonium is store for 72000 yrs. The fraction of .its that remain:-
Which of the following transition in a hydrogen atom emit photon of the highest frequency:
Nucleolus of an atom of mass No. 24 and charge no. 11 consists of
O2 molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms ______.
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:
If λa, λb and λc represent the Kα, Kβ and Lα transition wavelengths in a hydrogen atom, respectively. Then which of the following is correct?
How is the size of a nucleus found experimentally? Write the relation between the radius and mass number of a nucleus.
Determine the distance of the closest approach when an alpha particle of kinetic energy 3.95 MeV approaches a nucleus of Z = 79, stops and reverses its directions.
