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ROHIT DAS@ 7:24pm 06-17-2013

College/Institute and Class

DINABANDHU ANDREWS COLLEGE
SIR,I AM CURRENTLY A I.ST YEAR STUDENT AT DINABANDHU ANDREWS COLLEGE.I AM LOOKING FORWARD TO PURSUING A SHORT-TERM COURSE IN HARDWARE AND NETWORKING NEXT YEAR.BUT,THERE ARE SO MANY DIFFERENT COURSES IN THIS SUBJECT OFFERED AT DIFFERENT INSTITUTES.BEING A STUDENT OF ELECTRONICS,SHOULD I GO FOR CCNA,PHP,ETC OR THE MODULES OF ETHICAL HACKING,AS ALSO WHICH INSTITUTE TO GO FOR?I AM LOOKING FORWARD TO YOUR ADVICE.
Replied on: 12:20am 06-20-2013

SORRY, CAN'T BE OF HELP TO YOU IN THIS REGARD. MIGHT AS WELL ASK YOUR TEACHERS.

Having said this, however, I might give you some general advice. Presuming you are a good and sincere student, it would perhaps be more prudent on your part to study and prepare tirelessly for the competitive exams, GATE, NET etc., passing which with good scores, would definitely open many more doors for you.

Since you asked, from what little I know about CCNA, it refers to Cisco certification (Cisco happens to be a very well known networking company..must have heard of Cisco routers that we use to connect our PCs or laptops to the internet!). I don't have much idea about the course though.

PHP is an open source scripting language that is mostly used in conjunction with apache web server and mysql database softwares (also open source) in most of the data centric websites in use. You could download and install the softwares onto your own PC, buy a good book alongside (Beginning PHP5, Apache, MySQL Web Development by Naromore et al. is a good book to get started) and learn the language by yourself.

Ethical hacking pertains to learning all about the tricks of the hackers and making use of the knowledge to make our networks and computers more secure. Again I have no idea of any certificate course in this field..however one can be certain that this field would become more and more important and provide increasing opportunities in the days to come.

ROHIT DAS@ 2:50pm 06-11-2013

College/Institute and Class

DINABANDHU ANDREWS COLLEGE
SIR,IS THERE ANY DIFFERENCE IN PRIORITIES B/W ELECTRONICS POST-GRADUATES AND ELECTRONICS ENGINEERS WHEN IT COMES TO CORPORATE HIRING?EQUIVALENTLY,WHAT IS THE DIFFERENCE(IF ANY) B/W ELECTRONICS POST-GRADUATES AND ELECTRONICS ENGINEERS ACCORDING TO CORPORATE PERSPECTIVE AND MODERN INDUSTRY STANDARDS?
Replied on: 12:45am 06-13-2013

Well, I don't think I am the right person to be answering this question!
Nonetheless, my take on this would be that if you are talking of the public sector, chances are that there will be less of a difference given the fact that the qualifying examination (IES or whatever remains the same). In the private sector, however, there could be a more visible difference in priorities, as you have put it.

Soumitra Mukherjee@ 6:45pm 06-10-2013
Sir,
I have seen that syllabus of part-1 of Electronic (Hon.) are divided into two modules. My question is whether papers from both the modules are started simultaneously from the beginning of the year or papers from module-1 are taught first in the class, followed by papers of the module-2.
Replied on: 12:26am 06-13-2013

Your first guess is correct.

SOURADIP MUKHERJEE@ 7:44am 06-06-2013

College/Institute and Class

class XII passed
Sir, whether the Electronic Equipment Maintanance course (B.Sc MAJOR) is run in Surendranath Evening College?
Secondly, is this course better than a diploma course in electronics and instrumentation?
Plz advise.
Replied on: 7:30pm 06-06-2013

The above course has stopped running since a few years back. It was run under a separate dept. independent of the electronics dept...hence I am unable to shed more light regarding the course, whether it would be run again or about its prospects.

Nonetheless, a diploma in electronics and instrumentation from a reputed institute may help you get a job after passing out.
A degree on the other hand may make you eligible to go for masters and seek a better job thereafter.

ROHIT DAS@ 10:29am 06-04-2013

College/Institute and Class

DINABANDHU ANDREWS COLLEGE
sir,how can one account for the presence of a line of longer wavelength in scattered spectrum of compton scattering?also,how does one account for the presence of unmodified wavelength in scattered compton spectrum?
Replied on: 7:01pm 06-10-2013

In Compton scattering, the incoming X-ray radiation of frequency nu may be thought of as a bundle of photons, each photon having an energy E=h*nu. These photons collide with free electrons in the target material and get scattered. In the process, each photon transfers some of its energy (E=h*nu) to the electron and gets scattered with a lower energy (E'=h*nu'). Lower energy photons represent e.m. radiation having lower frequncy nu' and equivalently higher wavelength lamda' (since lamda'=c/nu', c being the velocity of any e.m. wave).

Compton considered the conservation of momentum and relativistic energy to arrive at the expression for the wavelength shift (consult your text-book):

deltalamda = lamda'-lamda = h/(m_0*c) * (1-cos(theta)) [eqn. 1]

m0 being the rest mass of the electron and theta being the scattering angle.
Note that deltalamda >= 0 i.e. lamda' >= lamda
(since -1 <= cos(theta) <= +1).

-----------------------------------------------------------

In eqn. 1, if theta=0, then deltalamda=0 or lamda'=lamda
If the detector detecting the scattered beam is held in line with the incident beam, it would detect only radiation of unmodified wavelength consisting of x-rays which have just about managed to graze the free electrons.

This, however, fails to explain the presence of unmodified wavelength at other orientations of the detector (i.e. for theta >0). The phenomenon can be accounted for if we consider that the incident photons, in addition to colliding and being scattered by the free electrons, also collide and get scattered by bound electrons (bound tightly to the atoms). For the latter, eqn. 1 can still be applied, albeit after making a small change, replacing the rest mass of the electron (m_0) with that of the atom (M_0) to which it is bound, since now the collision may be thought to be between the photon and the atom. But M_0 being >> m_0, the R.H.S. in eqn. 1 becomes negligibly small, making lamda' almost equal to lamda.

ROHIT DAS@ 11:54am 06-03-2013

College/Institute and Class

DINABANDHU ANDREWS COLLEGE
SIR,WHAT IS MEANT BY INVERSE COMPTON SCATTERING?ALSO,WHAT IS MEANT BY MAGNETIC COMPTON SCATTERING?
Replied on: 10:31am 06-08-2013

As the name suggests, inverse Compton scattering is a scattering process through which energy is transferred from a charged particle to a photon as opposed to one in which energy is transferred from a photon to a charged particle (electron), as in Compton effect.

Google for more information on inverse Compton scattering and visit Wikipedia to know about magnetic quantum scattering.

EJAZ AHMED@ 10:48am 05-22-2013

College/Institute and Class

SURENDRANATH EVENING COLLEGE 1ST YEAR ELTA
The energy and momentum of a relativistic particle satisfy Einstein relation given by
E^2=p^2c^2+m^2c^4
where all the terms have their usual meanings. Using above relation and considering photon as relativistic particle, show that the rest mass of photon must vanish.
Replied on: 11:59pm 05-22-2013

The energy (E) associated with electromagnetic radiation and the momentum (p) carried by it can be shown (using Maxwell's equations) to be related by:
E=p*c (c being the velocity of the e.m. radiation)

This equation becomes the same as the equation in your question (relating the energy and momentum of a relativistic particle of rest mass m) if we consider the rest mass m to be zero.

Thus a particle of zero rest mass may be used to describe e.m. radiation..this particle is nothing but the photon.

BTW, I would like to see whether you have made some effort in trying to find the answers to your questions by yourself..

RIZWAN KHAN @ 4:07pm 05-20-2013

College/Institute and Class

DINABANDHU ANDREWS COLLEGE
SIR,WITH 3RD YR. EXAMS OVER,I AM,LIKE OTHERS , A BIT TOO NERVOUS AND SHAKY ABOUT MY FUTURE.SOME PEOPLE WANT ME TO GO FOR IT COURSES,SOME ARE WARNING ME AGAINST THE SAME,STATING THAT THE IT INDUSTRY IS AT ALL-TIME LOW AND EXTREMELY UNPREDICTABLE.MY PROFESSORS ARE SAYING IT'S NOT A GOOD IDEA TO GO FOR B.TECH AFTER B.SC,INSTEAD PURSUE M.SC,FOLLOWED BY M.TECH IN RELEVANT FIELD.WHAT SHALL I DO?IS IT AT ALL A GOOD IDEA TO GO FOR IT COURSES,ESPECIALLY TAKING INTO CONSIDERATION THE CURRENT STATUS OF THE INDUSTRY OR GO FOR RESEARCH WORK AND ACADEMIC FIELD?
Replied on: 12:13am 05-23-2013

I would agree with your professors..see my reply to an earlier post..in the midst of studying for your MSc prepare for the GATE, NET and other examinations and then try to pursue an MTech or a PhD.

That said however, many students have gone on to build a successful IT career as well after studying physics or electronics.

At this point, do not worry too much about your career. Study well but also enjoy your days in college and the university.

MOHAMMAD HOSSAIN@ 3:53pm 05-20-2013

College/Institute and Class

ASHUTOSH COLLEGE
SIR,I AM CURRENTLY A 3RD YR. STUDENT IN ASHUTOSH COLLEGE(ELECTRONICS HONOURS).MY QUESTION IS WHY ARE ELECTRONICS GRADUATES BARRED FROM PURSUING B.TECH OR M.TECH IN COMPUTER SC. AND ENGINEERING UNDER CALCUTTA UNIVERSITY(ALTHOUGH PHYSICS GRADUATES ARE ALLOWED)?ALSO,IS IT TRUE THAT TO PURSUE M.TECH IN COMPUTER SC. FROM JADAVPUR UNIVERSITY,ONE HAS TO APPEAR FOR ADMISSION TEST EVEN AFTER CLEARING GATE?
Replied on: 12:18am 05-23-2013

Electronic Science Honours is a relatively new course and the number of seats in the PG courses in Comp. Sc. are limited...that could be an explanation!

As for your second question, you should go to JU and enquire yourself.

ANIRUP MUKHERJEE@ 3:38pm 05-20-2013

College/Institute and Class

12th,just gave h.s exam in 2013
I have give h.s exam and i want to do physics honours,then i want to go for any technical courses.can you tell me about some technical courses ,physics(h) opens how many doors in the engineering and technical world.which technical course should i choose after completing physics (h).please mail me at ************ or 94**********
.
Replied on: 12:37am 05-23-2013

You could pursue post B.Sc. B.Tech. courses in comp. sc., radiophysics, electronic sc., optoelectronics, IT, applied physics etc from Rajabazar Sc. college or alternatively pursue M.Sc. and then go for either an M.Tech or a PhD. You should also sit for the GATE exam in the appropriate field and strive to get a decent score.

BTW, you should understand that this guestbook is an open forum which I intend to use to help students, if I can, with their academic queries. So mind your language when posting your question!!

ROHIT DAS@ 10:40pm 05-12-2013

College/Institute and Class

d.a.c
scope in optoelectronics?
Replied on: 2:50pm 05-20-2013

I presume from the initials above, you are a student of Dinabandhu Andrews College.
Recently I received a similar question from an M.Sc. student of the same college via email. Assuming you too are an M.Sc. student, I would suggest you both to prepare well and sit for the GATE exams. A good gate score would help you pursue (with fellowship) M.Tech. or even a Ph.D. at IITs, NITs, Rajabajar Sc. College, Jadavpur and Shibpur engineering colleges etc. You could find many faculty at these places doing great research work in optoelectronics and related fields. Talk with them through email, take their advice and suggestions. The degrees would surely help you to find very good jobs in the IT and telecommunication companies of repute.

You may appear in the SET and NET examinations to become eligible for lectureship jobs in colleges and universities. A good NET score will also help you apply for fellowships and jobs at the CSIR and other govt. labs doing work in related fields.

You may apply at ISRO (www.isro.org) and also sit for the IES (Indian Engineering services) exam conducted by UPSC.
Keep in mind that an M.Sc. in electronics is considered equivalent to a B.Tech. in Electronics engineering.

If you are interested, you may try to pursue MS and PhD degrees abroad. For that of course you must clear the GRE and other exams.

Short term certification courses in IT (related to your field) from reputable institutions may also be done parallely to help increase your employability.

P.S. A small word of advice. When posting on somebody's guestbook for the first time, avoid using initials, introduce yourself properly and be a bit more elaborate with your question.

drumasankar@ 1:08pm 04-15-2013

College/Institute and Class

SNEC, KOL-9
When U KNeel Down in front of God, He Stands Up For U & When HE Stands Up For U, No One Can Stand Against U. Wishing You and your family a blessed and prosperous 1420. umada
Replied on: 11:30am 04-20-2013

Thanks for the sermon.

Wishing you and your family too a happy 'bangla nobo borsho'.

drumasankar@ 1:05pm 04-15-2013

College/Institute and Class

SNEC, KOL-9
Is electronic science a fundamental science?
what is the basic difference between core science and multi-faced science?
Replied on: 11:28am 04-20-2013

So this is your question you spoke about in the teachers' room!

I am not sure if electronic science can be called a fundamental science, as say Physics or Chemistry.
However all science subjects have many faces and are interwined so much so that when we talk of or work with one, we inadvertently or otherwise make use of another. This interdisciplinary nature of science subjects is all the more manifested when pursuing research for our Ph.D.s.

You might as well try a google search for a better answer to your question.

EJAZ AHMED@ 9:03pm 04-13-2013

College/Institute and Class

Surendranath Evening College B.SC 1st year ELTA
Sir, will our classes start on tuesday the 16th April 2013?
Replied on: 11:15am 04-20-2013

The university part II exams would continue till 26th April..however no exams are scheduled on 24th. You and your classmates may come to the college on 24th evening, should you want. I would take a class informally, as classes are probably officially suspended in this period.

Alternatively, you may post your academic questions, if any, through your guestbook.

Hope all of you are studying hard for your ensuing examinations.

EJAZ AHMED@ 4:47pm 03-28-2013

College/Institute and Class

Surendranath Evening College, B.SC 1st year ELTA
The dynamic resistance of an ideal Zener diode is zero but the dc resistance is not so. Why?
Replied on: 3:26pm 04-05-2013

Recall from the experiments you have performed to study the reverse I-V characteristics of an ordinary p-n diode and a zener diode that the I-V curve for the zener diode is almost parallel to the Y (Current axis) while that for the ordinary diode has a less-steeper slope.

Since the dynamic or a.c resistance is given by the slope of the curve (delta V/ delta I) and since delta V is almost zero, the a.c resistance of reverse biased the zener diode is very low (close to zero). The d.c resistance is the ratio of the absolute value of the voltage across the diode to the absolute value of the current flowing through it at that voltage and hence would always have a definite value. The value would however decrease dramatically with slight increase of the reverse voltage exceeding the zener voltage.

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