When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from the photoelectric cell, then
Text Solution
Verified by ExpertsThe correct answer is:
B
Cut-off voltage is independent of intensity and hence, remains the same.
Since distance becomes 3 times, intensity 
becomes 
.
Hence, photocurrent also decreases by this factor
i.e., becomes 
.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A beam of protons with a cross-sectional area of is moving with a velocity of . Then charge dens…
A particle of mass at rest decays into two particles of masses and , having non-zero velocities.…
An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of a photoele…
When an inert gas is filled in the place vacuum in a photocell, then
A photon of 1.7 × × 10 -13 Joules is absorbed by a material under special circumstances. The correc…
The maximum velocity of an electron emitted by light of wavelength incident on the surface of a me…