D. C. Pandey Solutions for Chapter: Modern Physics, Exercise 19: Objective Problems [Level 2]

A radioactive sample $S_1$ having the activity $A_1$ has twice the number of nuclei as another sample $S_2$ of activity $A_2$. If $A_2=2A_1$, then the ratio of the half-life of $S_1$ to the half-life of $S_2$ is

When a neutron is disintegrated to give a $\beta$-particle:

Assume the graph of specific binding energy versus mass number is as shown in the figure. Using this graph, select the correct choice from the following.

Pick out the correct statement from the following.

The speed of electromagnetic wave in a vacuum depends upon the source of radiation. It

The de-Broglie wavelength of an electron in the ground state of the hydrogen atom is

The orbital frequency of an electron in the hydrogen atom is proportional to

The product of linear momentum and angular momentum of an electron of the hydrogen atom is proportional to $n^{\mathrm{x}}$, where $x$ is