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Rc

on May 24, 2025

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Starting the Blogger

on July 12, 2011

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Today, for the first time tried to create the blog account.

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+3-I-S-NEP-Major-I-P-1-Sc-Phy . 2024 | Full Marks : 100 PART-I | 1. Answer the following Questions. | 1x10 The trace of $y=3^x$ is symmetrical about ____ axis. The second term of Taylor series expansion for the function $(1-x)^{-2}$ is ____. Write the unit vector perpendicular to ($\hat{i} + \hat{j}$) lies in same plane. For any scaler function $\phi$, the value of curl grad $\phi$ is ____. The Dirac delta function $\delta(-x)=$ _____. The function $\tan x $ is not continuous at $x=$_____. Does the function $f(x)$ which is continuous at $x_0$ will be necessarily differentiable at xo ? (yes/no/can not say) The value of $\oint_c \vec{r}.\vec{dr}$ is _____. In spherical polar co-ordinate system $\hat{r}\times\hat{\theta}=$____. Does the vector triple product is associative ? (yes/no/ can not say) PART-II | Answer all | 2x9 Solve $dy/dx = 2x-7$ where $y(2)= 0$. Trace the curve $y = x \sin x$. If $\vec{a}$ is a constant vector then ...

Rc

05.01.24 Durga Prasad Sir, IOP Intro : $\alpha, \beta, \gamma$ decay and detectors. $p \rightarrow n$ free proton to neutron conversion doesn't happen due to mass restriction $m_n \gt m_p$, So, $n \rightarrow p \rightarrow H_2O$ happens and nature exists. $e^- - e^+$ annihilation expt. in CMP using $^{22}Na$. 2 Photon $e^+ e^-$ angular momentum experiment. Energetically favourable colliding beam experiment. $\sqrt{s} \propto E_a$. Not fixed target $s\propto\sqrt{E_a}$ Anjan Giri, (IIT, Hyed) Particle Physics (02:00 am) Focus on neutrino and flavor Physics. Sudhanwa Patra (HoD., Dept. Of Physics, IIT, Bhillai) Fascinating neutrino Physics (03:30 pm) 06.01.24 Chandrasekhar Bhamidipati General Relativity refresher course. Newton's laws: $p=mv$, $F=dp/dt = dm/dt, v + m dv/dt = 0 + ma$ As mass is generally constant. $F_i =m_i \ddot{x_i}$ where $i=1, 2, 3$ for (x, y, z). Newton's Laws are defined in the background of Eucl...

Compiling Fortran

It is always a good habit to use two compilers to test the error. And particularly gfortran does it better. Few Good Points that really saves: IMPLICIT NONE Defining parameters like pi, h etc. Avoid : EXP Like Expressions. For frequent use of particular values involving complex arithmetic operations, pre-calculate and store it in a table once and reuse the values. Few Good compiler Options: gfortran -fbounds-check prog.f90 It checks for the possible out-of bound arrays, and reports. gfortran -Wall prog.f90 It checks and reports all possible errors and warnings. To have a better portable and efficient code rectify all points to make 0 warnings. After complete debugging in gfortran, compile by ifort and run to take the advantage of the latter's fastness.

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