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Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?
- a)one-fourth
- b)zero
- c)doubled
- d)four times
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Light of frequency 1.5 times the threshold frequency is incident on a ...
f0 < f1 = 1.5 f0
∴ f2 = 0.75 f0
for given condition
fincident< fthreshold
∴ f2 = 0.75 f0
for given condition
fincident< fthreshold
so no photo electron emission
i = 0
i = 0
Most Upvoted Answer
Light of frequency 1.5 times the threshold frequency is incident on a ...
Photoelectric Current and Threshold Frequency
Photoelectric current is the flow of electrons due to the photoelectric effect. When light of a certain frequency falls on a photosensitive material, electrons are emitted from its surface. This frequency is called the threshold frequency. If the incident light has a frequency greater than the threshold frequency, the photoelectric current increases.
Effect of Changing Frequency and Intensity
When the frequency of the incident light is halved and the intensity is doubled, the photoelectric current decreases to zero. This can be explained by the following points:
• Threshold frequency remains the same: The threshold frequency of the photosensitive material does not change with the frequency or intensity of the incident light.
• Halving the frequency: When the frequency of the incident light is halved, its energy is also halved. The energy of the incident light is not sufficient to eject electrons from the surface of the photosensitive material.
• Doubling the intensity: Doubling the intensity of the light increases the number of photons incident on the surface of the photosensitive material. However, the energy of each photon remains the same. Therefore, the number of electrons emitted from the surface also remains the same.
• Net effect: The net effect of halving the frequency and doubling the intensity of the incident light is that the energy of each photon is reduced to half, which is not sufficient to eject electrons from the surface of the photosensitive material. Therefore, the photoelectric current becomes zero.
Conclusion
When light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, and the frequency is halved and intensity is doubled, the photoelectric current becomes zero.
Photoelectric current is the flow of electrons due to the photoelectric effect. When light of a certain frequency falls on a photosensitive material, electrons are emitted from its surface. This frequency is called the threshold frequency. If the incident light has a frequency greater than the threshold frequency, the photoelectric current increases.
Effect of Changing Frequency and Intensity
When the frequency of the incident light is halved and the intensity is doubled, the photoelectric current decreases to zero. This can be explained by the following points:
• Threshold frequency remains the same: The threshold frequency of the photosensitive material does not change with the frequency or intensity of the incident light.
• Halving the frequency: When the frequency of the incident light is halved, its energy is also halved. The energy of the incident light is not sufficient to eject electrons from the surface of the photosensitive material.
• Doubling the intensity: Doubling the intensity of the light increases the number of photons incident on the surface of the photosensitive material. However, the energy of each photon remains the same. Therefore, the number of electrons emitted from the surface also remains the same.
• Net effect: The net effect of halving the frequency and doubling the intensity of the incident light is that the energy of each photon is reduced to half, which is not sufficient to eject electrons from the surface of the photosensitive material. Therefore, the photoelectric current becomes zero.
Conclusion
When light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, and the frequency is halved and intensity is doubled, the photoelectric current becomes zero.
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Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?a)one-fourthb)zeroc)doubledd)four timesCorrect answer is option 'B'. Can you explain this answer?
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