Photoelectric EffectHard
Question
An image of the sun is formed by a lens of focal length 30 cm on the metal surface of a photo-electric cell and it produces a current I. The lens forming the image is then replaced by another lens of the same diameter but of focal length 15 cm. The photoelectric current in this case will be : (In both cases the plate is kept at focal plane and normal to the axis lens). (Assume saturation current only).
Options
A.I/2
B.2I
C.I
D.4 I
Solution
The current I is proportional to light energy falling on the lens per second which is same in the two cases. Hence same I.
Create a free account to view solution
View Solution FreeMore Photoelectric Effect Questions
Photo electron emitted from the surface of sodium metal are :-...Characteristic X-rays are not obtained in the spectrum of H-atom because :...Wavelength of emitted light from a monochromatic source is 6000 then energy of photon is :-...-In Davisson - Germer experiment, Nickel crystal acts as :-...Proton and α - particles have the same De-broglie wavelength. What can be same for both of them :...