Question:
Light of frequency 2 times the threshold frequency is incident on a photo-sensitive material. If the frequency is made \( \frac{1}{3} \)rd and intensity is doubled then the photocurrent will:
Light of frequency 2 times the threshold frequency is incident on a photo-sensitive material. If the frequency is made \( \frac{1}{3} \)rd and intensity is doubled then the photocurrent will:
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In the photoelectric effect, if the frequency of light is below the threshold frequency, no photocurrent will be generated, no matter how much the intensity is increased.
Updated On: Feb 9, 2026
- be doubled
- be zero
- be \( \frac{1}{3} \)rd
- be tripled
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The Correct Option is B
Solution and Explanation
Step 1: Understanding Photoelectric Effect.
The photoelectric effect depends on the frequency of the incident light. If the frequency of the light is less than the threshold frequency, no photocurrent is generated, regardless of the intensity. Since the frequency is now reduced to \( \frac{1}{3} \)rd of the original value, it will be below the threshold frequency and no electrons will be ejected from the material. Hence, the photocurrent will be zero.
Step 2: Final Answer.
Thus, the photocurrent will be zero.
The photoelectric effect depends on the frequency of the incident light. If the frequency of the light is less than the threshold frequency, no photocurrent is generated, regardless of the intensity. Since the frequency is now reduced to \( \frac{1}{3} \)rd of the original value, it will be below the threshold frequency and no electrons will be ejected from the material. Hence, the photocurrent will be zero.
Step 2: Final Answer.
Thus, the photocurrent will be zero.
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