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# IGNOU PHE 11 Modern Physics 2018 2019

IGNOU PHE 11 Modern Physics 2018 2019

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### Questions :

1. The length of a rocket is measured to be 6.0 m by an observer on Earth as it moves with respect to the Earth at a speed of 0.8c. What is the length of the rocket as measured by an astronaut inside the rocket?

2. With what constant velocity must a person travel from the centre to the edge of our galaxy in order to cover the distance of 3.0 × 104 light years in 40 years?

3. Two β-particles move in opposite directions with velocities of 0.5c in the laboratory frame. Calculate the velocity of one β-particle in the moving frame attached to the other β-particle.

4. In a nuclear reactor one deuterium atom(D) and one triton atom(T) at rest decay into one alpha particle(He) and one neutron(n). Obtain an expression for the momentum of the alpha particle and the neutron and the value of the kinetic energy of the alpha particle given that the values of the rest masses are:

mD= 2.01474 amu; mT = 3.017 amu; = 4.00387 amu; mn =1.00898 amu and 1 amu = 931 MeV.

5. Use Heisenberg’s uncertainty principle to estimate the ground state energy of the harmonic oscillator.

6. A thermal neutron with a speed v corresponding to the average thermal energy at temperature T = 300 K is incident on a crystal. Will a diffraction pattern be observed? Explain,

7. For the operator A = a x + i b p where a and b are constants, calculate [A, x] and [A, A].

8. The wavefunction for a particle is defined by:

Determine

i) the normalization constant N, and

ii) the probability that the particle will be found between x = 0 and x = L / 8

9. Calculate the mean kinetic and potential energies of a simple  harmonic oscillator which is in its ground state.

10. For a motion of a particle of mass μ in a spherically symmetric potential show that L2 and Lz commute with the Hamiltonian.

11. Obtain the most probable value and expectation value of r for the ground state of a hydrogen atom.

12. For a hydrogen-like atom, give all possible spectral terms for n = 2 and n = 3.

13. At what potential difference must an X-ray tube operate to produce X-rays with a minimum wavelength of 2 .

14. Write any five applications of radioisotopes.

15. What is synchrocyclotron? How it is used to accelerate particles to a few hundred MeV of energy? Explain.

16. Explain the Shell Model of the atomic nucleus.

17. Define binding energy. Calculate the binding energy per nucleon of  Fe. Given  55.934932u,mu 1.008665u and mp1.007825 u.

18. The disintegration constant of 238 U is 4.87  10 −18S −1 × Calculate its half-life (in years). Also calculate the number of disintegration per second from 1 gram of Uranium. It is given that Avogadro’s number = 6.02 ×1023 .

*This Assignment/Project Help Book is only for demonstration Purpose that how to solved/write them. As IGNOU is a distance Learning Approach, many students were not aware how to write and how much to write the Assignment/Project. So, it is our request treat it as a help book guide. First read the entire .pdf file after buying and then write yourself in your own words.

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• IGNOU PHE 11 Modern Physics

• IGNOU BDP (Bachelor Degree Programmes) Solved Assignment 2018 2019

• Latest 2018 2019 Solved Assignment

• PHE 11 Modern Physics

• BDP (BACHELOR DEGREE PROGRAMMES) PHE 11

• Buy Now PHE 11 Solved Assignment

PHE 11 : Modern Physics
2018

UNIVERSITY IGNOU BACHELOR DEGREE PROGRAMMES BDP Bachelor Degree Programmes PHE 11 Modern Physics SOFT COPY 2019 Assignment
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IGNOU PHE 11 Modern Physics 2018 2019
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