A small object at rest, absorbs a light pulse of power $20 \,mW$ and duration $300\, ns$. Assuming speed of light as $3 \times 10^8 \,m / s$, the momentum of the object becomes equal to :
Electron beam used in an electron microscope, when accelerated by a voltage of $20 kV$, has a de-Broglie wavelength of $\lambda_0$. If the voltage is increased to $40 kV$, then the de-Broglie wavelength associated with the electron beam would be:
Match List I with List II.
Choose the correct answer from the options given below:
The radius of the $2^{\text {nd }}$ orbit of $Li ^{2+}$ is $x$. The expected radius of the $3^{\text {rd }}$ orbit of $Be ^{3+}$ is
Major product of the following reaction is
What is the major product of the following reaction?
Two objects \(A\) and \(B\)are placed at \(15\, cm\) and \(25\, cm\) from the pole in front of a concave mirros having radius of curvature \(40\, cm\). The distance between images formed by the mirror is:
As shown in the figure a block of mass \(10\, kg\) lying on a horizontal surface is pulled by a force \(F\)acting at an angle \(30^{\circ}\), with horizontal For \(\mu_{ s }=0.25\), the block will just start to move for the value of \(F\) : [Given g=10ms-2]
Arrange the following in decreasing acidicstrength
The structures of major products A , B and C in the following reaction are sequence
For electron gain enthalpies of the elements denoted as\(\Delta_{ eg } H\), the incorrect option is :
In a reaction,
reagents ' X ' and ' Y ' respectively are :
Given below are two statements :
Statement I : Sulphanilic acid gives esterification test for carboxyl group
Statement II : Sulphanilic acid gives red colour in Lassigne's test for extra element detection In the light of the above statements, choose the most appropriate answer from the options given below :
