BPHYS102 Applied Physics for CSE Set – 2 Solved Model Question Paper

BPHYS102 Set – 2 Solved Model Question Paper 1st/2nd Semester P Cycle for Computer Science and Engineering (CSE) Stream 22 Scheme

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MODULE – 1

1.A] Obtain the expression for energy density using Einstein’s A and B coefficients.
Conclude that B_{12} = B_{21} .

1.B] Describe attenuation in optical fibers and explain various fiber losses.

1.C] Given Numerical Aperture (NA) = 0.30 and refractive index of core = 1.49,
calculate the critical angle at the core–cladding interface.

OR

2.A] Discuss the applications of LASER in:
i) Bar-code scanners
ii) LASER cooling

2.B] Explain point-to-point communication using optical fibers.

2.C] Calculate the population ratio for a transition with wavelength 694.3 nm at 300 K.

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MODULE – 2

3.A] Derive an expression for de Broglie wavelength by analogy and explain its significance.

3.B] Explain the wave function, its mathematical form, and physical significance.

3.C] Calculate energy of the first three quantum states for an electron in a 1D potential well of width 0.1 nm.

OR

4.A] Define Eigenfunctions and Eigenvalues. Derive the normalized eigenfunction for a particle inside a 1D infinite potential well.

4.B] Use Heisenberg’s uncertainty principle to show that an electron does not exist inside the nucleus.

4.C] An electron has a de Broglie wavelength of 1 nm. Calculate its momentum and energy.

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MODULE – 3

5.A] Discuss the working of a phase gate, mention its matrix representation and truth table.

5.B] Explain the terms:
i) Orthogonality
ii) Orthonormality
Give examples for both.

5.C] — (Question content missing in the document. Let me know if you want me to infer or skip this)

OR

6.A] Explain the representation of a qubit using a Bloch Sphere.

6.B] Explain:
i) Single qubit gate
ii) Multiple qubit gate
with suitable examples.

6.C] Explain the matrix representation of |0⟩ and |1⟩ states and apply the identity operator I to these states.

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MODULE – 4

7.A] List the failures of classical free electron theory and mention assumptions of quantum free electron theory of metals.

7.B] Explain the Meissner Effect and describe the variation of critical magnetic field with temperature.

7.C] Tin has critical temperature Tc=3.7T_c = 3.7 K and critical field at 0 K = 0.0306 T.
Calculate the critical field at 2 K.

OR

8.A] Describe the phenomenon of superconductivity and explain the BCS theory qualitatively.

8.B] Give a qualitative explanation of RF SQUID with a neat sketch.

8.C] Calculate the temperature at which there is 1% probability that an energy state
0.5 eV above Fermi level is occupied.

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MODULE – 5

9.A] Explain the importance of:
i) Size and scale
ii) Weight and strength
in animations.

9.B] Mention the general steps in Monte Carlo method and explain how to determine π using it.

9.C] Describe the calculation of:
i) Push time
ii) Stop time
with examples.

OR

10.A] Sketch and explain motion graphs for:

• Linear motion
• Easy ease
• Easy ease-in
• Easy ease-out

10.B] Discuss how to model probability for proton decay.

10.C] A slowing-in object has a first-frame distance of 0.5 m and a first slow-in frame of 0.35 m.
Calculate:

• Base distance
• Number of frames in the sequence