class 12

Missing

JEE Advanced

If $λ_{cu}$ is the wavelength of $K_{α}$ X-ray line of copper (atomic number 29) and $λ_{Mo}$ is the wavelenght of the $K_{α}$ X-ray line of molybdenum (atomic number 42), then the ratio $λ_{cu}/λ_{Mo}$ is close to .

Connecting you to a tutor in 60 seconds.

Get answers to your doubts.

Let $f:R→R,g:R→Randh:R→R$ be the differential functions such that $f(x)=x_{3}+3x+2,g(f(x))=xandh(g(g(x)))=x,forallx∈R.Then$ (a)g'(2)=$151 $ (b)h'(1)=666 (c)h(0)=16 (d)h(g(3))=36

Let $O$be the origin and let PQR be an arbitrary triangle. The point S is such that$OPO˙Q+ORO˙S=ORO˙P+OQO˙S=OQ$.$OR+OPO˙S$Then the triangle PQ has S as its:circumcentre (b) orthocentre (c) incentre (d) centroid

Let $PR=3i^+j^ −2k^andSQ=i^−3j^ −4k^$determine diagonals of a parallelogram $PQRS,andPT=i^+2j^ +3k^$be another vector. Then the volume of the parallelepiped determine by the vectors $PT$, $PQ$and $PS$is$5$b. $20$c. $10$d. $30$

A vertical line passing through the point $(h,0)$ intersects the ellipse $4x_{2} +3y_{2} =1$ at the points $P$ and $Q$.Let the tangents to the ellipse at P and Q meet at $R$. If $δ(h)$ Area of triangle $δPQR$, and $δ_{1}21 ≤h≤1max δ(h)$ A further $δ_{2}21 ≤h≤1min δ(h)$ Then $5 8 δ_{1}−8δ_{2}$

Let n be the number of ways in which 5 boys and 5 girls can stand in a queue in such a way that all the girls stand consecutively in the queue. Let m be the number in which 5 boys and 5 girls stand in such a way that exactly four girls stand consecutively in the queue. Then the value of $nm $ is ____

Circle(s) touching x-axis at a distance 3 from the origin and having an intercept of length $27 $ on y-axis is (are)

How many $3×3$ matrices $M$ with entries from ${0,1,2}$ are there, for which the sum of the diagonal entries of $M_{T}M$ is 5? (A) 126 (B)198 (C) 162 (D) 135

Let $XandY$be two events that $P(X)=31 ,P(X|Y)=21 andP(Y|X)=52 $then:$P(Y)=154 $ (b) $P(X∪Y)=52 $$P(X_{prime}|Y)=21 $ (d) $P(X∩Y)=51 $