# Quantum Mechanics 1 | Week 1

Session: JAN-APR 2024

Course name: Quantum Mechanics I

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#### Q1. The energy eigenvalue and the corresponding eigenfunction for a particle of mass m in a one-dimensional potential V(x) are,E=0, (x)=A/(x^2+a^2)where A is a positive constant. The form of potential V(x) isa) h2(3x^2-a^2)/m(x^2+a^2)^2b) h2(x^2-a^2)/2m(x^2+a^2)^2c) h2(3x^2-a^2)/m(x^2+a^2)^3d) h2(x^2-a^2)/2m(x^2+a^2)^3

Answer: a) h2(3x^2-a^2)/m(x^2+a^2)^2

Q2. Consider a photon that scatters from an electron at rest. If the photon scatters at an angle 60° with a wavelength (λ’) that is twice its incident wavelength (λ), then the angle at which the electron recoils will be _________ degrees. (Answer should be an integer.)

Answer: 30

Q3. For a particle in a one dimensional box, the ground state energy is given by E0. The allowed energies of such a particle are
a) 2E0
b) 4E0
c) 6E0
d) 9E0

Answer: b) 4E0, d) 9E0

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These are Quantum Mechanics 1 Week 1 Assignment Nptel Answers

Q4. Consider a particle in a two dimensional box whose ground state energy is €0. Then the energy E = 13€0 is two fold degenerate.
a) True
b) False

Answer: a) True

Q5. Suppose the 2nd energy level of a particle in a cubical box is given by E = 6Eg where Eg, is the ground state energy. Then the immediate 3rd energy level will be ______ fold degenerate. (Answer should be an integer.)

Answer: 3

Q6. The non-zero commutator brackets are
a) [z, px]
b) [z,py]
c) [x^2, px]
d) [x, px2]

Answer: a), c), d)

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Q7.

Answer: c) √15/16a5

Q8.

Answer: d

Q9. The normalized wavefunction of a particle is Ψ(x) = Aexp(iax – ibt), where A, a and b are constants. The uncertainty in its momentum is
a) ha
b) h2a2
c) 0
d) -ha

Answer: c) 0

These are Quantum Mechanics 1 Week 1 Assignment Nptel Answers

Q10.

Answer: b) False

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