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Question Bank Solutions for BE Automobile Engineering Semester 1 (FE First Year) - University of Mumbai - Applied Physics 1

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Applied Physics 1
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What are crystal imperfections Mention any two significance of it .

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography

An ultrasonic pulse of 0.09M Hz sends down towards the sea-bed which returns after 0.55 seconds. The velocity of ultrasonic waves in sea water is 1800 m/sec . calculate the depth of sea and wavelength of ultrasonic pulse.

[7] Ultrasonics
Chapter: [7] Ultrasonics
Concept: Ultrasonic Wave Generation

Draw the following : (1,-1,3) ,(2,0,0) , [0,0,-1]
An electron is accelerated through 1200 volts and is reflected from a crystal. The second order reflection occurs when glancing angle is 60°. Calculate the inter planar spacing of the crystal.

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography

Draw (123)

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography

Draw(321)

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography

Draw (102)

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography

Discuss any three applications of Ultrasonic waves

[7] Ultrasonics
Chapter: [7] Ultrasonics
Concept: Ultrasonic Wave Generation

State Heisenberg's Uncertainty Principle. Show that electron doesn'texist in
the nucleus.Find the accuracy in the position of an electron moving with speed 350
m/sec with uncertainty of 0.01%.

[2] Quantum Mechanics
Chapter: [2] Quantum Mechanics
Concept: Introduction to Quantum Mechanics

Explain Point defects in crystals.

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography

What is reverberation time? Discuss sabine formula. 

[6] Acoustics
Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)

State ‘magnetostriction effect’. Mention any two application of ultrasonic waves

[7] Ultrasonics
Chapter: [7] Ultrasonics
Concept: Magnetostriction Oscillator

Draw and explain the unit cell of sodium chloride (NaCl) crystal determine effective number of NaCl molecule per unit cell and co-ordination number.

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

State any five factors affecting the acoustics of the building and give the remedies for each. 

[6] Acoustics
Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)

Calculate the critical radius ratio of an ionic crystal in ligancy-6 . what is the maximum size of cation in ligancy 6 configuration when size of anion is 2.02A°?

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

Draw the unit cell of HCP structure and work out the no. of atoms per unit cell.

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

What is the principle of solar cell? Write its advantages and disadvantages

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

Explain the factors on which reverberation time depends .

[6] Acoustics
Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)

Find the following parameter for DC(Diamond Cubic) structure:- 
⦁ No. of atoms per unit cell.
⦁ Co-ordination number.
⦁ Nearest atomic distance.
⦁ Atomic radius.
⦁ APF.

[1] Crystal Structure
Chapter: [1] Crystal Structure
Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

A classroom has dimension 10×8×6m3. the reverberation time is 3 sec. calculate the total absorption of surface and average absorption. 

[6] Acoustics
Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)

Explain the principle, construction and working of a Magnetostriction Oscillator.

[7] Ultrasonics
Chapter: [7] Ultrasonics
Concept: Magnetostriction Oscillator
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