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A Molecule of Hydrogen Contains Two Protons and Two Electrons. the Nuclear Force Between These Two Protons is Always Neglected While Discussing the Behaviour of a Hydrogen Molecule. Why?

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प्रश्न

A molecule of hydrogen contains two protons and two electrons. The nuclear force between these two protons is always neglected while discussing the behaviour of a hydrogen molecule. Why?

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उत्तर

Inside the nucleus, two protons exert nuclear force on each other. These forces are short-ranged (a few fm), strong and attractive forces. They also exert electrostatic repulsive force (long-ranged). While discussing the behaviour of a hydrogen molecule, the nuclear force between the two protons is always neglected. This is because the separation between the two protons in the molecule is  ∼ 70 pm which is much greater than the range of the nuclear force.

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अध्याय 46: The Nucleus - Short Answers [पृष्ठ ४४०]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
अध्याय 46 The Nucleus
Short Answers | Q 3 | पृष्ठ ४४०

संबंधित प्रश्न

From the relation R = R0A1/3, where R0 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).


The radius of \[\ce{^27_13X}\] nucleus is R. The radius of \[\ce{^125_53Y}\] nucleus will be ______.


The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is ______.


The stable nucleus that has a radius half that of Fe56 is:


Calculate approximately the ratio of the nuclear radii of the gold isotope \[_{79}^{197}Au\] and the silver isotope \[_{47}^{107}Ag\].


The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nuclei is larger than that of helium by:


The Q value of a nuclear reaction A + b → C + d is defined by Q = [mA + mb − mC − md]c² where the masses refer to the respective nuclei. Calculate the Q-value of the reaction and state whether this reaction is exothermic or endothermic.

\[_1^1\mathrm{H}+_1^3\mathrm{H}\rightarrow_1^2\mathrm{H}+_1^2\mathrm{H}\]

Atomic masses are given to be

\[\mathrm{m(}_{1}^{1}\mathrm{H)}=1.007825\mathrm{u}\]

\[\mathrm{m(}_{1}^{2}\mathrm{H)}=2.014102\mathrm{u}\]

\[\mathrm{m(}_{1}^{3}\mathrm{H})=3.016049\mathrm{u}\]


Assertion (A): All nuclei are not of the same size.

Reason (R): The size of the nucleus depends on atomic mass.


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How is the nuclear radius defined?


The minimum distance reached by an alpha particle approaching a positively charged nucleus before being turned back is called the:


Which experiments provide more accurate measurements of nuclear size and help determine the distribution of charge inside the nucleus?


If the mass number \[A\] of a nucleus increases, its radius increases as \[A^{1/3}\]. This implies that:


Since the nucleus is approximately spherical with \[R = R_0 A^{1/3}\], its volume \[V = \frac{4}{3}\pi R^3\] is proportional to:


The approximate density of nuclear matter is:


The density of matter in a neutron star is:


For an iron nucleus with mass number \[A = 56\] and mass \[55.85\,\text{u}\], taking \[R_0 = 1.2 \times 10^{-15}\,\text{m}\] and \[R = R_0 A^{1/3}\], the calculated nuclear density using \[\rho = \frac{m}{V}\] is about:


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