Question
$8$ mercury drops coalesce to form one mercury drop, the energy changes by a factor of
✓
Answer
(c) As volume remains constant therefore $R = {n^{1/3}}r$
$\frac{{{\rm{Energy\, of \,big \,drop}}}}{{{\rm{Energy \,of\, small\, drop}}}} = \frac{{4\pi {R^2}T}}{{4\pi {r^2}T}} = \frac{{{R^2}}}{{{r^2}}}$$ = {(8)^{2/3}} = 4$
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
Mass per unit area of a circular disc of radius $\mathrm{a}$ depends on the distance $\mathrm{r}$ from its centre as $\sigma(\mathrm{r})=\mathrm{A}+\mathrm{Br} .$ The moment of inertia of the disc about the the axis, perpendicular to the plane and passing through its centre is
→If the following input signal is sent through a $PN-$junction diode, then the output signal across $R_L$ will be
→In the figure, mass of a ball is $\frac{9}{5}$ times mass of the rod. Length of rod is $1 \,m$. The level of ball is same as rod level. Find out time taken by the ball to reach at upper end of rod. (in $S$)
→The sun emits a light with maximum wavelength $510\, mm$ while another star $X$ emits a light with maximum wavelength of $350\, nm$. What is the ratio of surface temperature of sun and the star $X$
→What will be the acceleration due to gravity at height $h$ if $h >> R$. Where $R$ is radius of earth and $g$ is acceleration due to gravity on the surface of earth
→A hypothetical atom has only three energy levels. The ground level has energy, $E_1 = - 8\, eV$. The two excited states have energies, $E_2 = - 6\, eV$ and $E_3 = - 2\, eV$. Then which of the following wavelengths will not be present in the emission spectrum of this atom? .............. $nm$
→Four bulbs, red, green, white and blue (denoted by $R$ $G, W$ and $B$ respectively) are kept in front of a converging lens (as shown in the figure below). The observer sees that the green and blue bulbs are kept to the left of the principal axis, while the red and white bulbs are kept to the right of the principal axis. He also sees that the red and green bulbs are above principal axis, while the white and blue bulbs are below the principal axis. The screens $S_1$ and $S_2$ are set appropriate positions for the focusing to view the images. Choose the figure that correctly represents the images as seen by the observer.
→Lens used to remove long sightedness (hypermetropia) is
A wire when connected to $220\,V$ mains supply has power dissipation ${P_1}$. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is ${P_2}$. Then ${P_2}:{P_1}$ is
→Two steel wires having same length are suspended from a ceiling under the same load. If the ratio of their energy stored per unit volume is $1: 4,$ the ratio of their diameters is
→