MCQ
When a hydrogen atom is raised from the ground state to an excited state
- ✓$P.E.$ increases and $K.E.$ decreases
- B$P.E.$ decreases and $K.E.$ increases
- CBoth kinetic energy and potential energy increase
- DBoth $K.E.$ and $P.E.$ decrease
✓
Answer
Correct option: A.
$P.E.$ increases and $K.E.$ decreases
a
(a) $P.E.$ $ \propto - \frac{1}{r}$ and $K.E.$ $ \propto \frac{1}{r}$
As $r$ increases so $K.E.$ decreases but $P.E.$ increases.
(a) $P.E.$ $ \propto - \frac{1}{r}$ and $K.E.$ $ \propto \frac{1}{r}$
As $r$ increases so $K.E.$ decreases but $P.E.$ increases.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A body starts rolling down an inclined plane of length $L$ and height $h$. This body reaches the bottom of the plane in time $t$. The relation between $L$ and $t$ is
→A certain charge $Q$ is divided into two parts $q$ and $(Q-q) .$ How should the charges $Q$ and $q$ be divided so that $q$ and $(Q-q)$ placed at a certain distance apart experience maximum electrostatic repulsion?
→
N equally spaced charges each of value q , are placed on a circle of radius R . The circle rotates about its axis with an angular velocity $\omega$ as shown in the figure. A bigger Amperian loop B encloses the whole circle where as a smaller Amperian loop A encloses a small segment. The difference between enclosed currents, $I_A-I_B$, for the given Amperian loops is
The figure shows an isosceles triangle wire frame with apex angle equal to $\pi /2$. The frame starts entering into the region of uniform magnetic field $B$ with constant velocity $v$ at $t= 0$. The longest side of the frame is perpendicular to the direction of velocity. If $i$ is the instantaneous current through the frame then choose the alternative showing the correct variation of $i$ with time.
→The current flowing through a coil of resistance $900\, ohms $ is to be reduced by $90\,\%$. What value of shunt should be connected across the coil ............. $\Omega $
→$10\, Cells$, each of $emf$ $'E'$ and internal resistance $'r'$, are connected in series to a variable external resistance. Figure shows the variation of terminal potential difference of their combination with the current drawn from the combination.$Emf$ of each cell is ................ $V$
→In the Kundts tube experiment (shown in fig. $(i)$), the rod is clamped at the end instead of clamping it at the center as shown in fig. $(ii).$ It is known that speed of sound in air is $330\ m/s$, powder piles up at successive distance of $0.6\ m$ and length of rod used is $1\ m$, speed of sound in rod is .... $\frac{m}{s}$
→An air bubble of radius $0 .1\, cm$ is in a liquid having surface tension $0.06\, N/m$ and density $10^3\, kg/m^3$. The pressure inside the bubble is $1100\, Nm^{-2}$ greater than the atmospheric pressure. At ....... $m$ depth is the bubble below the surface of the liquid ? $(g\, = 9.8\, ms^{- 2})$
→The intensity of the light from a bulb incident on a surface is $0.22 \,W / m ^{2}$. The amplitude of the magnetic field in this light-wave is_______ $\times 10^{-9} \,T$. (Given : Permittivity of vacuum $\epsilon_{0}=8.85 \times 10^{-12} \,C ^{2} N ^{-1} m ^{-2}$, speed of light in vacuum $c =3 \times 10^{8} \,ms ^{-1}$ )
→A tuning fork vibrates with $2$ beats in $0.04$ second. The frequency of the fork is .... $Hz$
→