Consider following statements : A. Atoms of each element emit characterstics spectrum. B. According

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13.Nuclei

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Consider the following statements :

$A.$ Atoms of each element emit characterstics spectrum.

$B.$ According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit.

$C.$ The density of nuclear matter depends on the size of the nucleus.

$D.$ A free neutron is stable but a free proton decay is possible.

$E.$ Radioactivity is an indication of the instability of nuclei.

Choose the correct answer from the options given below

$A,B$ and $E$ only

$B$ and $D$ only

$A, C$ and $E$ only

$A,B, C,D$ and $E$

(JEE MAIN-2021)

Solution

$(A)$ True, atom of each element emits characteristic spectrum.

$(B)$ True, according to Bohr's postulates $m v r=\frac{n h}{2 \pi}$ and hence electron resides into orbits of specific radius called stationary orbits.

$(C)$ False, Density of nucleus is constant

$(D)$ False, $A$ free neutron is unstable decays into proton and electron and antineutrino.

$(E)$ True unstable uncleus show radioactivity.

Standard 12

Physics

From the relation $R=R_{0} A^{1 / 3},$ where $R_{0}$ is a constant and $A$ is the mass number of a nucleus, show that the nuclear matter density is nearly constant (i.e. independent of $A$).

easy

How many times is the density of the nucleus more than the density of water ?

easy

Assertion : The binding energy per nucleon, for nuclei with atomic mass number $A > 100$, decreases with $A$.

Reason : The nuclear forces are weak for heavier nuclei.

easy

(AIIMS-2013)

Which of the following isotopes is normally fissionable ?

easy

If radius of the $^{27}_{13}Al$ nucleus is taken to be $R_{Al}$, then the radius of $^{125}_{53}Te$ nucleus is nearly

medium

(AIPMT-2015)

Solution

Similar Questions

From the relation $R=R_{0} A^{1 / 3},$ where $R_{0}$ is a constant and $A$ is the mass number of a nucleus, show that the nuclear matter density is nearly constant (i.e. independent of $A$).

How many times is the density of the nucleus more than the density of water ?

Assertion : The binding energy per nucleon, for nuclei with atomic mass number $A > 100$, decreases with $A$. Reason : The nuclear forces are weak for heavier nuclei.

Which of the following isotopes is normally fissionable ?

If radius of the $^{27}_{13}Al$ nucleus is taken to be $R_{Al}$, then the radius of $^{125}_{53}Te$ nucleus is nearly

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Assertion : The binding energy per nucleon, for nuclei with atomic mass number $A > 100$, decreases with $A$.

Reason : The nuclear forces are weak for heavier nuclei.