SATHEE: nuclei Question 20

nuclei Question 20

Question: Q. 1. The gravitational force between a $H$ -atom and another particle of mass $m$ will be given by Newton’s law :

$F = G \frac{M . m}{r^{2}}$ , where $r$ is in $km$ and

(a) $M = m_{proton} + m_{electron}$

(b) $M = m_{proton} + m_{electron} - \frac{B}{c^{2}} (B = 13.6 eV)$ .

(d) $M = m_{proton} + m_{electron} - \frac{| V |}{c^{2}} (| V | =$ magnitude of the potential energy of electron in the $H$ -atom).

[NCERT Exemplar]

Show Answer

Solution:

Ans. Correct option : (b)

Explanation: During formation of $H$ -atom some mass of nucleons convert into energy by the equation

$E = m c^{2}$

This energy is used to bind the nucleons along with nucleus. So mass of atom becomes slightly less than sum of actual masses of nucleons and electrons.

Actual mass of $H$ atom

$= M_{p} + M_{e} - \frac{B . E .}{c^{2}} (\frac{B}{c^{2}} = Binding energy)$

So, the binding energy of $H$ atoms is $13.6 eV$ per atom.

Nuclei

nuclei Question 20

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Nuclei

nuclei Question 20

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu