The main function of cadmium used in the nuclear reactor is:
It removes the heat produced at the core of the reactor
It gives energy to the secondary neutrons produced in the nuclear fission
It slows down the fast moving secondary neutrons produced during the nuclear fission
To capture the slow neutron produced in the nuclear reactor
What is the frequency of the electron in the first orbit of hydrogen atom of orbital radius $0.5 \times 10^{-10} \mathrm{~m}$, if its orbital velocity in that orbit is $2.2 \times 10^6 \mathrm{~ms}^{-1}$.
$3.49 \times 10^{15} \mathrm{~Hz}$
$3.49 \times 10^{13} \mathrm{~Hz}$
$6.98 \times 10^{15} \mathrm{~Hz}$
$6.98 \times 10^{13} \mathrm{~Hz}$
An object is dropped from a certain point A at a height ' h ' from the ground. During it's journey straight downwards, the object passes points $B$ and $C$ such that the ratio of time taken $t_1$ to cover $A B$ and $t_2$ to cover $B C$ is $1:(\sqrt{2}-1)$. What is the ratio of distances $A B: B C$ ?
$1: 1$
$(\sqrt{2}-1): 1$
$1: \sqrt{2}$
$\sqrt{2}: 1$
In a single slit diffraction experiment, the diffraction pattern is observed on a screen placed at a distance of 2 m from the slit of 1 mm width. If the distance between the first dark fringe on either side of the central to right fringe is 2.2 mm . what is the wave length of the monochromatic light from a distance source, used in this experiment?
$3900^{\circ} \mathrm{A}$
$11000^{\circ} \mathrm{A}$
$1100^{\circ} \mathrm{A}$
$5500^{\circ} \mathrm{A}$
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