Photoelectric EffectHard
Question
The work done in splitting a drop of water of 1 mm radius in to 106 droplets is (surface tansion of water 72 × 10-3 N/m):
Options
A.5.98 × 10-5
B.10.98 × 10-5
C.16.95 × 10-5
D.8.95 × 10-5
Solution
Radius of new droplet if be r then.
106 ×
πr3 = π(0.001)3
r3 = 10-15 ⇒ r = 10-5
Increase in surface area
[4π×(10-5)2 × 106] - [4π×(10-3)2]
[4π × 10-4]-[4π × 10-6] = 4π10-6[100-1]
= 4π × 10-6 × 99 = 4π × 10-6 × 99
Work done = surface tension × increase in surface area
= 72 × 4p × 99 × 10-6 × 10-3 = 8.95 × 10-5
106 ×
πr3 = π(0.001)3r3 = 10-15 ⇒ r = 10-5
Increase in surface area
[4π×(10-5)2 × 106] - [4π×(10-3)2]
[4π × 10-4]-[4π × 10-6] = 4π10-6[100-1]
= 4π × 10-6 × 99 = 4π × 10-6 × 99
Work done = surface tension × increase in surface area
= 72 × 4p × 99 × 10-6 × 10-3 = 8.95 × 10-5
Create a free account to view solution
View Solution FreeMore Photoelectric Effect Questions
Absorption of X-ray is maximum in which of the following sheets :...Let p and E denote the linear momentum and the energy of a photon. For another photon of smaller wavelength (in same med...When a centimeter thick surface is illuminated with light of wavelength λ, the stopping potential is V. When the sa...Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to theground state irradiates a ...The structure of solids is investigated by using :...