Embibe Experts Solutions for Chapter: Atomic Physics, Exercise 1: Exercise 1

In a Rutherford scattering experiment when a projectile of charge $Z_1$ and mass $M_1$ approaches a target nucleus of charge $Z_2$ and mass $M_2$, the distance of the closest approach is $r_{\circ }$. The energy of the projectile is

The electrons of Rutherford's model would be expected to lose energy because, they

Which of these is non-divisible

An ionisation chamber, with parallel conducting plates as anode and cathodes have singly charged positive $5\times {10}^7$ ions per ${\mathrm{cm}}^3\text{.}$ The electrons, are moving towards the anode with velocity $0.4 \mathrm{m} {\mathrm{s}}^{-1}\text{.}$ The current density from anode to cathode is $4 \mathrm{\mu A} {\mathrm{m}}^{-2}\text{.}$ The velocity of positive ions moving towards cathode is

Doubly ionised helium atom and hydrogen ions are accelerated, from rest, through the same potential difference. The ratio of final velocities of helium and hydrogen is

An oil drop carrying a charge $q$ has a mass $m \mathrm{kg}\text{.}$ It is falling freely in air with terminal speed $v$. The electric field required to make the drop move upwards with the same speed is

In Millikan oil-drop experiment a drop of charge $Q$ and radius $r$ is kept constant between two plates of potential difference of $800 \mathrm{V}$. Then charge on another drop of radius $2r$ which is kept constant with a potential difference of $3200 \mathrm{V}$ is

The first model of atom was proposed by