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It the radius of a nucleus of mass number 3 is R. then the radius of a nucleus of mass number 81 is
$R = R_0 (3)^{1/3}$ , $R^1 = R_0 (81)^{1/3}$ ${R^1\over R} =({81\over 3 })^{1/3} = {(27)} ^ {1/3} =3 $ $ \therefore R^1 = 3R $
The nucleus of which of following Pairs of nuclei are isotones
Isotones nucler have same neutrons i.e. A-Z are equal. From the given pairs $_{34} {se}^{74},_{31}{Ca}^{71}$ has same neutrons
The control rod in a nuclear reactor is made of
Control rods in a nuclear reactor are made of materials that can absorb neutrons to control the rate of the nuclear reaction. Cadmium is a material that is highly effective at absorbing neutrons, which is why it is commonly used in control rods.
which of the following isotopes normally fissonable
Uranium-235 ( $_{92}{U}^{235}$ ) is a naturally occurring isotope of uranium that is fissionable. This means it can sustain a nuclear chain reaction, which is the principle behind nuclear reactors and atomic bombs.
which of the following statement is true
$_{92}U^{238} --->_{90}Th^{234}+ _{2}He^{4}$
A Free neutron decays into a Proton, an electron and
$n-->p+e^- + \bar \upsilon$ $P-->n+e^-+\upsilon$
The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is ro. The distance of the closest approach when the $\alpha$- particle is fired at the same nucleus with kinetic energy 2k will be.
At a distance of closest approach kinetic energy of $\alpha$ -particle = Potential energy of the system $ {1\over 2} {mv}^2 = K_1 ={Kq_1q_2 \over ro} $ $ \therefore ro = {Kq_1q_2 \over ro} $ When kinetic energy 219 than $ro^1 = {ro \over 2} $
which of the following series in the spectrum of hydrogen alon lies in the visible legion of the electro magnetic spectrum?
The Balmer series of hydrogen emission lines lies in the visible region of the electromagnetic spectrum. These lines occur when an electron transitions from a higher energy level to the second energy level (n = 2).
If 13.6 eV energy is required to ionige the hydrogen atom the energy required to remove the electron form n=2 state is
Inigation potentier (For hydrogen) $E_n = {13.6 \over n^2} eV$
It $N_o$ is the original mass of the substance of halt lift 5 years, the amount of substance left after 15 years is
${N \over no} = (1/2)^{t/T^{1/2}}$
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