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• The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true? The correct answer is option A) Its kinetic energy increases and its potential and total energies decrease. Physics 1 answer
• Photoelectrons are emitted when 400 nm radiation is incident on a surface of work function 1.9eV. =-54.4 eV, -13.6 eV, -6.04 eV, -3.4 eV, -2.176 ev, -1.51 eV Difference of energies lying between 2 and 4 eV is -3.4+6.04=2.64 eV -2.176+6.04... Physics 2 answers
• The ratio of series limit wavelength of Balmer series to wavelength of first line of paschen series is ………. 7/36 is answer https://lh3.googleusercontent.com/-djiaQ2JfDPE/YayM6Plq9AI/AAAAAAAAC2o/a8czELAm8tUaT_CogztAF--yBfNQCikxwCNcBGAsYHQ/image.png Physics 1 answer
• A parallel beam of uniform, monochromatic light of wavelength 2640 A has an intensity of 200W/m2 . The number of photons in 1mm3 of this radiation are …. Solution is 884 photons/mm³ Physics 1 answer
• A aeroplane is flying horizontally with speed of 432 km/hr at height h meter from ground. Its angle of elevation The correct answer is option A)1200 sqrt3 Explanation:: Uncategorized 1 answer
• Mass of Li3+ is 8.33 times mass of proton Li3+ and proton are accelerated through same potential difference. Then ratio of debroglie's The correct answer is 2 Explanation:: Physics 1 answer
• The gas evolved due to anaerobic degradation of vegetation causes? the correct option is a) Global warming and cancer Explanation:: The gas CH4 evolved due to anaerobic degradation of vegetation which causes... Random 1 answer
• Is Maharashtra board exam 2021 postponed ? Class 10 Secondary School Certificate (SSC) board and Class 12 Higher Secondary Certificate (HSC) board examinations have been postponed by... Discuss 1 answer
• If A and B are two skew-symmetric matrices of order n, then, (a) AB is a skew-symmetric matrix (c) is the correct option We are given A’ = -A and B’ = -B; Now, (AB)’ = B’;A’ = (-B) (-A) = BA = AB, if A and B commute. Rotational Dynamics 1 answer
• If A=[ 1 2 2 2 1 2 2 2 1] and A^-1 exists and A≠0 , then (A^2-4A)A^-1= The correct answer is option a) beginbmatrix -3& 2 & 2\\ 2 & -3& 2\\ 2&2&-3 endbmatrix Video explaination:: https://youtu.be/7B6Et9Lb3gw Uncategorized 1 answer
• A stationary body explodes into two fragments each of rest mass 1kg that move apart at speeds of 0.6c relative to the original body Correct answer is option is B) 2.5 kg Physics 1 answer
• Find the initial momentum of electron if the momentum of electron is changed by pm and the De Broglie wavelength associated with it changes by 0.50 % Initial momentum is 200p_m Explaination: dλoverλ× 100 =0.5 dλoverλ× 100 =0.5over100=1over200 and triangle p=p_m p=hoverλ, differentiating dp... Physics 1 answer
• Given that x = -9 is a root of ||The other two roots are ______ and ________ . the correct answer is available here watch this video by neha mam Uncategorized 2 answers
• If the lines ax + y + 1 = 0, x + by + 1 = 0 and x + y + c = 0 (a, b, c being distinct and different from 1 ) are concurrent, then value of The correct answer is option c) 1 if the given lines are concurrent , then beginarray|ccc|cc| a& 1 & 1 \\ 1 & b & 1\\ 1 &1 & c\\ endarray=0... Uncategorized 1 answer
• The top of a ladder 6 metre long is resting against a vertical wall on a level pavement, Answer: The top slides down at 1/√(5) ≈ 0.447 m/s. Let the foot of the ladder be x m from the wall and the top be y m above the ground. The... Mathematics 1 answer
• How to square easily fastest method vedic maths Watch this video and download pdf book https://youtu.be/vnZOdIwfZks Tips&Tricks 2 answers
• [MCQ ] Molecular solids are __________ crystalline solids amorphous solids a) crystalline solids , is the correct answer Rotational Dynamics 2 answers
• Niobium forms bcc structure the density of niobium is 8.55 g/cm3 and length of unit cell edge the correct answer is 1.62 × 10²^(1 ) EXplaination ^() Rotational Dynamics 2 answers
• Alluminium crystallizes in cubic close packed structure with unit cell edge 353.6 pm correct answer is r=125pm units=2.26×10²² Explanation https://youtu.be/RoQib35FfB4 Rotational Dynamics 1 answer
• The density of iridium is 22.4 g/cm3 . The unit cell of iridium is fcc. Calculate the radius of iridium atom. Molar mass of iridium is 192.2 g/mol. The correct answer is 136 pm Explanation:: Rotational Dynamics 1 answer
• As per IUPAC nomenclature, the name of the complex [Co (H2O)4(NH3 )2]C13 is correct option is d) diamminetctraaquacobalt (III) chloride First of all, the compound has complex positive part [Co(H₂O)₄(NH₃)₂]₃₊ therefor... Random 1 answer
• The oxidation state of Fe in the brown ring complex [Fe(H2O)5NO]SO4 is:(a) + 1 (b) + 2 (c) + 3 (d) + 4 Corret option is a) +1 Explaination :: [Fe(H₂O)₅NO]SO_(4 → ([Fe(H₂O)₅NO] )⁺²+(SO₄)⁻² ) (fe^+)⁺¹ =+2 charge on fe= +1 Random 1 answer
• The number of enantiomer in a glucose molecule is (a) 16 (b) 12 (c) 4 (d) 9 Correct option is A) 16 Explaination: Glucose molecule the number of chiral carbon is = 4 Formula for enantiomer, = 2ⁿ total number of enant... Random 1 answer
• Find out the number of enantiomer, meso isomer and total number of optical isomers for the following compound Correct option is C) 4,0,4 explaination : Number of enantiomer = 2n (n is the number of chiral carbon ) Number of meso isomer = 0 Total numb... Random 1 answer