PDF Course Code: PHY-1201 Course Physics II

International Islamic University Chittagong

Course Code:

PHY-1201

.. '

Department of Electrical and Electronic Engineering B. Sc. Engineering in EEE

Final Examination, Spring 2022

" .' • _ .J" •••.. , Course Title:

Physics II

Full Marks: 50 Time: 2 hours 30 minutes

(i) The figures in the right-hand margin indicate full marks

(ii) Course Outcomes and Bloom's Levels are mentioned in additional Columns Course Outcomes (COs) of the Questions

OCOI Identify the basic knowledge of different areas of physics as well as engineering aspect.

CO2 Design solution for physics problems that meet the specified needs for public health and safety, societal and environmental concerns.

Bloom's Levels of the Questions

Letter Symbols

I

^R

I

^U

I

^App

I

An

I

^E

I

^C

Meaning

I

Remember

I

Understand

I

Apply

I

Analyze

I

Evaluate

I

Create

Part A

[Answer the questions from the followings]

1. a) Explain physical significance of ohm's law. Draw the RC circuit COl An+C 2+5 and determine the current equation in RC circuit when the charge is

growth.

b) A capacitor of capacitance 0.5 j..I.F is first charged and then CO2 An 3 discharged through a resistance of IOmega ohm. Find the time. The

potential will take to fall to half its original value.

2. a) Compare the crystalline solid and amorphous. Prove that facking

COl U+E 2+5 fraction for simple cubic structure

=

0.52.

b) Draw the following plane for the unit cell of crystal structure.

CO2 An ^{,.., .)}

(a) (111), (b) (200), (c) (100) Or,

2. a) Explain the terms the resistance and specific resistance. Judge the

COl U+E 2+5

statement "the average value of alternating current for half cycle is Imean = 0.693/0 "

b) A capacitor is charged by DC supply through a resistance of 70 CO2 An 3 mega ohm. If it takes 0.6 sec for the charge to reach three quarters

of its final value, what is the capacitance of the capacitor?

Part B:

[Answer the questions from the followings]

3. a) Explain the postulates of special relativity? The length of moving COl U + E 6 object is smaller than length of rest object. Justify it.

b) The length of a rocket on the ground is 100 m. When rocket moves C02 An 4 with respect to a stationary observer on the ground its length

appears to be 99.5m. Calculate the speed of the rocket?

4. a) Explain the term; photo electric effect and Zeeman effect? CO I U + E 2+5 According the fundamental postulates of Bohr's atom model,

construct an expression for the total energy level equation of hydrogen atom.

b) The photoelectric surface has a work function of 20 e V. What is the C02 An 3 maximum velocity of the photoelectrons emitted by light of

frequency 1015 hertz incident on the surface?

5. a) Compare the alpha decay, beta decay, gamma decay. Justify the COl U + E 2+5 statement "the number of radioactive atoms decreases exponentially

with time".

b) The half-life of radon is 50 days, find decay constant of radon. CO2 An 3 Or,

5. a) What do you understand of time dilation? Justify the statement "the COl U+E 2+5 moving clock always appears slow".

b) The particle is moving with a speed of 0.5 c. Calculate the ratio of CO2 An 3 its rest mass and the mass while in motion.