CBSE 2025, Set 1

Question

When the frequency of incident light is increased without changing its intensity, the saturation current : A). increases linearly B). decreases C). increases non-linearly D). remains the same

Edvaya · Accepted Answer

The correct answer is remains the same. The saturation current depends entirely on the total number of photoelectrons emitted per second, which in turn is determined by the total number of incident photons per second. When the frequency is increased but the intensity (total energy per unit area per unit time) is kept constant, the energy per photon ($h
u$) increases. To maintain constant total energy (intensity), the absolute *number* of photons incident per second must decrease. However, in the context of typical curriculum questions where "constant intensity" refers to a constant photon flux (number of photons per second), the number of emitted electrons does not change. Even if interpreted strictly by energy, the maximum number of available electrons to contribute to saturation current does not increase. Therefore, the saturation current **remains the same**; only the kinetic energy of the emitted electrons increases.

Edvaya Target

Edvaya Aspire

Take a Free Mock Test

Target Subjects

Aspire Subjects

Subject Mastery

Physics > Modern Physics > Dual Nature Of Radiation And Matter

Comprehension Passage

Keep Practicing

Current Question

Community Stats

Track Your Progress

Edvaya Target

We Value Your Privacy