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A small particle of mass 10
-6
gm moves along the x-axis; its speed is uncertain by 10
-6
m/s. (a) What is the uncertainty in the x coordinate of the particle? (b) Repeat the calculation for an electron assuming that the uncertainty in its velocity is also 10
-6
m/s. Use the known values for electrons and Planck’s constant.
Answered
First Semester
An electron is placed midway between two fixed charges, q
1
= 2.5 × 10
-10
C and q
2
= 5 × 10
-10
C. If the charges are 1 m apart, what is the velocity of the electron when it reaches a point 10cm from q
2
?
Answered
First Semester
A large wheel of radius 0.4m and moment of inertia 1.2 kgm
2
, pivoted at the center, is free to rotate without friction. A rope is wound around it and a 2kg weight is attached to the rope, when the weight has descended 1.5m from its starting position, (a) what is its downward velocity? (b) what is the rotational velocity of the wheel?
Answered
First Semester
Explain Bloch theorem? Discuss its use in the Kronig-Penny model and hence in band theory.
Answered
First Semester
Discuss magnetic dipole moment. What is its effect on atoms and on molecules? Explain.
Answered
First Semester
Describe the Frank-Hertz experiment. Discuss its result and outline limitations.
Answered
First Semester
Set up a differential equation for an oscillation of a spring using Hooke’s and Newton’s second law. Find the general solution of this equation and hence the expressions for the period, velocity, and acceleration of oscillation.
Answered
First Semester
Explain the process of semiconductor purification by describing the terms zone refining, single crystal growth, and scheme of IC production. Give an account of electronic component fabrication on a chip.
Answered
First Semester
A roulette wheel with moment of inertia
I = 0.5 kgm
2
rotating initially at 2 rev/sec coasts to a stop from the constant friction torque of bearing. If the torque of the bearing. If the torque is 0.4 Nm, how long does it take to stop?
Answered
Physics
Find the truth table for the circuit shown in the figure. What logic function will the circuit perform if the constant +5 V input to the first two gates is changed to ground potential?
Answered
First Semester
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