Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12

Nuclei

Out of the two characteristics—the mass number (A) and the atomic number (Z) of a nucleus, which one does not change during nuclear α-decay?

For, nuclear alpha-decay, β = _-1e⁰Thus, the mass number (A) of the element _ZX^A does not change during the nuclear alpha-decay.

405 Views

Two nuclei have mass numbers in the ratio 1: 3. What is the ratio of their nuclear densities?

Ratio of mass number in the nucleii, A₁ :A₂ = 1:3

Since, the nuclear density is same for all nuclei and is independent of the mass ratio, therefore,
∴ ρ₁:ρ₂ = 1:1

1940 Views

Two nuclei have mass numbers in the ratio 27:125. What is the ratio of their nuclear radii?

Given,
Rato of mass numbers , $A_{1} : A_{2} = 27 : 125$

$\Rightarrow$ $\frac{A_{1}}{A_{2}} = \frac{27}{125}$

Radius of nucleus is, $R = R_{0} A^{1 / 3}$

Therefore,
$\frac{R_{1}}{R_{2}} = {(\frac{A_{1}}{A_{2}})}^{1 / 3} = {(\frac{27}{125})}^{1 / 3} = \frac{3}{5}$

Thus, Ratio of radii is 3:5.

1181 Views

Which of the following particles has similar mass to that of the protons?

Proton
Neutron
Positron
Neutrino

Positron

127 Views

A radioactive substance decays to

\frac{1}{16} th

of its initial activity in 40 days. The half-life of the radioactive substance expressed in days is

139 Views

Chapter Chosen

Book Chosen

Subject Chosen

Book Store

Previous Year Papers

Nuclei

Two nuclei have mass numbers in the ratio 27:125. What is the ratio of their nuclear radii?