class 12

Missing

JEE Main

The height at which the acceleration due to gravity becomes $9g $ (where g = the accleeration due to gravity on the surface of the earth) in terms of R, the radius of the earth is

Connecting you to a tutor in 60 seconds.

Get answers to your doubts.

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by

If the mean deviation of the numbers $1,1+d,1+2d,…,1+100d$ from their mean is 255, thenthe d is equal to

The ionization enthalpy of hydrogen atom is $1.312×10_{6}Jmol_{−1}$. The energy required to excite the electron in the atom from $n=1ton=2$ is

A die is thrown. Let A be the event that the number obtained is greater than 3. Let B be the event that the number obtained is less than 5. Then $P(A∪B)$is

For a reaction

Let A be a $2×2$ matrix Statement 1 : $adj(adjA)=A$ Statement 2 : $∣adjA∣=∣A∣$

An insulated container of gas has two chambers separated by an insulating partition. One of the chambers has volume \displaystyle{V}_{}

The $pK_{a}$ of a weak acid, HA, is 4.80. The $pK_{b}$ of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be