Home
Class 11
PHYSICS
When liquid medicine of density rho is t...

When liquid medicine of density `rho` is to be put in the eye, it is done with the help of a dropper. As the bylb on the top of the dropper is pressed. A drop frons at the opening of the dropper. We wish to estimate the size of the drop.
We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy, To determine the size. We calculate the net vertical force due to the surface tension T=0.11 when the radius of the drop is R=1.4mm. when this force become smaller than the weight of the drop the drop gets detached from the dropper.
After the drop detaches, its surface energy is

A

`1.4 xx 10^(-6)J`

B

`2.7 xx 10^(-6)J`

C

`5.4 xx 10^(-6)J`

D

`8.1 xx 10^(-6)J`

Text Solution

Verified by Experts

The correct Answer is:
B
Surface energy of the drop
`U = TA`
`= 0.11 xx 4pi (1.4 xx 10^(-3))^(2)`
`= 2.7 xx 10^(-6) J`
Promotional Banner

Topper's Solved these Questions

  • SURFACE TENSION

    RESONANCE ENGLISH|Exercise Exercise- 3 PART - II|7 Videos

  • SURFACE TENSION

    RESONANCE ENGLISH|Exercise Advanced Level Problems|17 Videos

  • SURFACE TENSION

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - IV|5 Videos

  • STRING WAVES

    RESONANCE ENGLISH|Exercise Exercise|32 Videos

  • UNITS, DIMENSION & MEASUREMENT

    RESONANCE ENGLISH|Exercise Exercise|27 Videos

Similar Questions

Explore conceptually related problems

When liquid medicine of density rho is to be put in the eye, it is done with the help of a dropper. As the bylb on the top of the dropper is pressed. A drop frons at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy, To determine the size. We calculate the net vertical force due to the surface tension T when the radius of the drop is R. when this force become smaller than the weight of the drop the drop gets detached from the dropper. After the drop detaches, its surface energy is

When liquid medicine of density rho is to be put in the eye, it is done with the help of a dropper. As the bylb on the top of the dropper is pressed. A drop frons at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy, To determine the size. We calculate the net vertical force due to the surface tension T when the radius of the drop is R. when this force become smaller than the weight of the drop the drop gets detached from the dropper. If the radius of the opening of the dropper is r, the vertical force due to the surface tension on the drop of radius R (assuming rlt ltR) is

When liquid medicine of density rho is to be put in the eye, it is done with the help of a dropper. As the bylb on the top of the dropper is pressed. A drop frons at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy, To determine the size. We calculate the net vertical force due to the surface tension T when the radius of the drop is R. when this force become smaller than the weight of the drop the drop gets detached from the dropper. If r=5xx10^(-4)m,rho=10^(3) kg m^(-3), g=10ms^(-2), T=0.11Nm^(-1), The radius of the drop when it detaches from the dropper is approximately,

Write the locus of a stone dropped from the top of a tower.

A drop of liquid takes nearly a spherical shape because .

When water droplets merge to form a bigger drop

When water droplets merge to form a bigger drop

The excess pressure inside a spherical drop of water is four times that of another drop. Then, their respective mass ratio is

A drop of liquid of density rho is floating half-immersed in a liquid of density d . If sigma is the surface tension the diameter of the drop of the liquid is

When a piece of sodium metal is dropped in water, hydrogen gas evolved because