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why do electron electron enter first in 4s n then in 3d orbital while electron goes frm 4s before 3d?why??????????????? ...

WAT ARE THE POSSIBLE METHODS OF convertin HOMOGENOUS N CARBON ATOMed RING TO (N+1) CARBON ATOMed RING??? ...

Calculate the capacity, between A and B , of the infinite network... I am getting answer as 2 μ F...but answer is given as 4 μ F.. In the figure all the capacities are in μF.. *Image* My metod: C0=1 + (2*Co) ---------- (Co ...

A hydrogen electrode placed in a buffer solution of CH3COONa and CH3COOH in the ratios of x:y and y:x has electrode potential(oxidation) E1 volts and E2 volts respectively at 25°C. what is the pKa of acetic acid? ...

A bag contains unlimited number of white, red, black and blue balls. The number of ways of selecting 10 balls so that there is atleast one ball of each colour is...... ...

When electron in grnd state of H atom is excited with an energy greater than E2 - E1 but less than E3 - E1 electron will get excited to n=2 True or false ? ...

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1) Five isomeric para-di- substituted aromatic compounds, A to E with molecular formula C8H8O2 were given for identification. Based on the following observations give the structures of the compounds: =Both A and B form silver ...

draw the graph of ... x+y={x+y} ...

{sin x} = {x} I dont know the solution.. but this one looks intimidating for the first time.. :P Lets see if we can figure out something useful here. ...

a long horizontal metallic rod with length along the east-west direction is falling under gravity. The potential difference b#w it's 2 ends will a] increase with time b]0 c]constant d]decrease with time ...

The numbers of solutions of x1 + x2 + x3 = 51 (x1, x2, x3 being odd natural numbers) is....... ...

*Image* this is how i remember it.........(may not be same) starts off pure rollin with given parameters(figure) and when spring is unstreched!!!! a)find freq. b)max diplacement c)max. value of vo for which it rolls 1 day up ...

find no. of ways in which 4 letters can be put into 4 envelopes such dat nothin occupies its original place.............. ...

post derivation of multinomial theorm........................ ...

the angular amplitudeof a simple pendulum is (theta)0 The maximum tension in the string will be    a)mg(1+(theta)o2)         b)mg(1-(theta)o2)          c)mg (1+(theta)o)             d)mg(1- ...

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a particle of mass m rotates in a circle of radius a with uniform angular speed w It is viewed from a frame rotating about z-axis with a uniform angular speed wo The centrifugal force on the particle is ...

please solve ques no 20 , 30 and 41 ...

A bar of cross section A is subjected to equal and opposite tensile forces at its ends! consider a plane through the bar making an angle A with a plane at right angles to the bar. For what values of A is the shearing stress m ...

The mass and radius of a planet are twice that of the earth Then the period of oscillation of a seconds pendulum on that planet will be ans given is √2 sec But i think the ans should be 2 sec only Because it is the only tim ...

A square is filled with 100 small lamps, arranged in 10 rows and 10 columns. Some of them are on, the others are off. Each lamp has a push-button that, when pressed, switches all the lamps in its row and column (including the ...

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There is a solid cyllinder of radius R and length L of mass M and a charge Q uniformly distributed on the mass. There is an electric field E along the -ve X axis. gravity acts downwards The cyllinder is kept next to a wall. T ...

a trolley of mass 200 kg moves with a uniform speed of 36 kmhr on a frictionless track. a child of mass 20 kg runs on d trolley from one end to the other (10 m away) with a a speed of 4m/s relative to the trolley in a directi ...

sum1 solve H C Verma part 1 - newton's laws chapter... q . no.39 !!! class 11 be ban giya tha :'( abhi nahi banra.. :'( isse dukh ki baat aur kuchh ho sakti hai ?? :'( ...

I would like to know whether following topics are there in JEE syllabus 1.Fresnel biprism 2.Lloyd's mirror expt. 3.Heating effects of current 4.Doppler effect in current 5.Diffraction and polarisation ...