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IGNOU PHE-11
- Modern Physics,
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(January 2023 - December 2023)

PHE-11 Assignment

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IGNOU PHE-11 January 2023 - December 2023 - Solved Assignment

Are you looking to download a PDF soft copy of the Solved Assignment PHE-11 - Modern Physics? Then GullyBaba is the right place for you. We have the Assignment available in English language.

This particular Assignment references the syllabus chosen for the subject of Physics, for the January 2023 - December 2023 session. The code for the assignment is PHE-11 and it is often used by students who are enrolled in the B.Sc. Degree.

Once students have paid for the Assignment, they can Instantly Download to their PC, Laptop or Mobile Devices in soft copy as a PDF format. After studying the contents of this Assignment, students will have a better grasp of the subject and will be able to prepare for their upcoming tests.

IGNOU PHE-11 (January 2023 - December 2023) Assignment Questions

1. a) The mean lifetime of a muon is . If the muons are travelling with a speed of 0.95c, calculate the observed lifetime of the muon.

b) Two rockets of rest length L0 are approaching the earth from opposite directions with velocities of ±c/ 4. How long would one of them appear to the other?

c) How fast and in what direction must a galaxy S be moving, if an absorption line observed at a wavelength of 550 nm for a stationary galaxy is shifted to 480 nm for S.

d) Electrons in a television set are accelerated through a potential difference of 40 kV. Assuming that the electrons start from rest, calculate their velocity using the relativistic equation for the kinetic energy.

e) A particle of mass M, initially at rest, decays into two particles with rest masses m1 and m2 respectively. Show that the total energy of the mass m1 is:

2. a) Calculate the de Broglie wavelength of an electron which is accelerated through a potential difference of 15 kV.

b) Determine the normalization constant N for the following wave function:

where Ψ(r, t) is defined over 0 ≤ r ≤ ∞, E is the energy, Z is a constant, q is the charge of the electron, and m is the mass of the particle.

c) Estimate the minimum kinetic energy a proton confined to a nucleus of diameter 2.0×10-15 m may have.

d) Show that
[Ly, Lz ] = i h Lx

e) The normalized eigenfunction for a particle of mass m and energy E is where N and a are real constants. Given that V(x) = 0 at x = 0, determine E.

3. a) Calculate < px > for the ground state harmonic oscillator eigen function.

b) X-rays from a cobalt (Z = 27) tube have a strong K line of wavelength 1.785 Å and a weak line due to chromium impurity (Z = 24). Using Moseley’s law, calculate the wavelength of the weak line.

c) Determine the average kinetic energy of the hydrogen atom in its ground state.

4. a) A radioactive sample emits n β-particles in 2s. In next 2s it emits 0.75 n β-particles. Calculate the mean life of the sample?

b) In a nuclear reactor 235U undergoes fission liberating 200 MeV of energy. The reactor has a 10% efficiency and produces 1000 MW power. If the reactor is to function for 10 years, find the total mass of uranium required.

c) Describe the principle and working of a cyclotron. Derive an expression of the maximum kinetic energy of the particle when it reaches the outermost radius of the cyclotron.

d) Write the charge, baryon number and spin of a photon and a proton.

IGNOU PHE-11 (January 2022 - December 2022) Assignment Questions

1. a) A rod of length 2.0 m at rest in the S’ frame is tilted at an angle of 60° with respect to the x’ axis. If the speed of S’ with respect to the S frame is 0.5c, calculate the length of the rod in the S frame and the angle it makes with the x-axis.
b) A spaceship approaching the Earth at a speed of 0.6c, shoots a bullet towards the earth at a speed of 0.7c. What will be the speed of the bullet as measured by an observer on earth.
c) The maximum wavelength of light emitted in the Balmer series of Hydrogen is 656 nm. This wavelength when emitted by a distant star is measured to be 1500 nm. Calculate the speed of the star.
d) The total energy of an electron produced in a nuclear reaction is 1.5 MeV. Calculate the momentum of the electron and its speed in the laboratory frame. The rest mass of the electron is 9.1 × 10 -31 kg and its rest energy is 0.51 MeV.

2. a) The lifetime of the excited state of an atom is 2.0 × 10 -31 s. Calculate the minimum uncertainty in its energy and the line width of the spectral line.
b) Determine the potential difference through which an electron at rest must be accelerated in an electron microscope such that its de Broglie wavelength is 0.05 nm.
c) The wave function for a particle of mass m is:

Calculate
i) the normalization constant A, and
ii) the expectation value of the momentum < px >
d) Determine the value of the commutator [Lz, L2]

3. a) Obtain the average value of r and potential energy of a hydrogen atom in its ground state:

b) i) Obtain the ground state terms of Li and Si.
ii) State with reasons whether following transitions for a multielectron atom are allowed:

c) What are characteristic x-rays? Write the selection rules for x-ray spectra. Draw approximate energy levels for L and M shells and show all the allowed transitions.
d) The wave function of a particle of mass m inside an infinite square well of width 2a (-a to +a) is given by

Obtain the values of A and B and the eigenenergy corresponding to the above eigenfunction.

4. a) The half-life of 235U is 7.0 X 10 8 years. Calculate the disintegration constant per second. Also, calculate the number of distintegrations per second from 1g of uranium. Take Avogadro’s number 6.03 X 10 23.
b) Plot a graph of the number of neutrons versus the number of protons for naturally occurring nuclei. Write the main features of the curve.
c) Determine the mass defect of 4 He and hence calculate its binding energy. Compare it with the value obtained on the basis of semi-empirical mass formula. Given

d) Discuss the general features of a nuclear reactor. What is the difference betweenshim control rods and regulating rods?
e) Write a short note on the followings:
i) Synchrotrons
ii) Scintillation counter

PHE-11 Assignment Details

  • University IGNOU (Indira Gandhi National Open University)
  • Title Modern Physics
  • Language(s) English
  • Session January 2023 - December 2023
  • Code PHE-11
  • Subject Physics
  • Degree(s) B.Sc.
  • Course Core Courses (CC)
  • Author Gullybaba.com Panel
  • Publisher Gullybaba Publishing House Pvt. Ltd.

Assignment Submission End Date

The IGNOU open learning format requires students to submit study Assignments. Here is the final end date of the submission of this particular assignment according to the university calendar.

  • 30th April (if Enrolled in the June Exams)
  • 31st October (if Enrolled in the December Exams).

Download Files & Sessions Details

Here are the PDF files that you can Download for this Assignment. You can pick the language of your choice and see other relevant information such as the Session, File Size and Format.

English Language

  • January 2023 - December 2023 26 Pages (0.00 ), PDF Format SKU: IGNGB-AS-BS-PHE11-EN-399
  • January 2022 - December 2022 20 Pages (0.00 ), PDF Format SKU: IGNGB-AS-BS-PHE11-EN-161

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  • All Solved Answers By IGNOU Experts.
  • Available for 3 Times for Download.
  • Downloadable Soft Copy in PDF.
  • Print Ready Format: A4 (21 x 29 x .20 cm (Width x Length x Height)