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Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearly
- a)N / 3, 3K
- b)3N, 3K
- c)3N, K
- d)3N, K / 3
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider a monochromatic linear source of light which is placed at a ...
Explanation:
When a monochromatic linear source of light is incident on a metal plate, electrons are ejected from the metal plate due to the photoelectric effect. The rate at which electrons are ejected is given by N (electrons per second) and the maximum kinetic energy of the ejected electrons is given by K.
Effect of bringing the source closer:
When the source is brought closer to a distance r/3, two things happen:
1. The intensity of the incident light increases.
2. The energy of each photon of the incident light increases.
Effect of increased intensity:
The rate of emission of electrons is directly proportional to the intensity of the incident light. Therefore, when the intensity of the incident light increases, the rate of emission of electrons also increases. In this case, since the source is brought closer by a factor of 3, the intensity of the incident light increases by a factor of 9 (since intensity is inversely proportional to the square of the distance). Therefore, the rate of emission of electrons becomes 9N.
Effect of increased energy of photons:
The maximum kinetic energy of the ejected electrons is directly proportional to the energy of the incident photons. When the source is brought closer, the energy of each photon increases. In this case, since the source is brought closer by a factor of 3, the energy of each photon increases by a factor of 3. Therefore, the maximum kinetic energy of the ejected electrons becomes 3K.
Conclusion:
So, when the source is brought closer to a distance r/3, the rate of emission of electrons increases to 9N and the maximum kinetic energy of the ejected electrons becomes 3K. Therefore, the correct answer is option C: 3N, K.
When a monochromatic linear source of light is incident on a metal plate, electrons are ejected from the metal plate due to the photoelectric effect. The rate at which electrons are ejected is given by N (electrons per second) and the maximum kinetic energy of the ejected electrons is given by K.
Effect of bringing the source closer:
When the source is brought closer to a distance r/3, two things happen:
1. The intensity of the incident light increases.
2. The energy of each photon of the incident light increases.
Effect of increased intensity:
The rate of emission of electrons is directly proportional to the intensity of the incident light. Therefore, when the intensity of the incident light increases, the rate of emission of electrons also increases. In this case, since the source is brought closer by a factor of 3, the intensity of the incident light increases by a factor of 9 (since intensity is inversely proportional to the square of the distance). Therefore, the rate of emission of electrons becomes 9N.
Effect of increased energy of photons:
The maximum kinetic energy of the ejected electrons is directly proportional to the energy of the incident photons. When the source is brought closer, the energy of each photon increases. In this case, since the source is brought closer by a factor of 3, the energy of each photon increases by a factor of 3. Therefore, the maximum kinetic energy of the ejected electrons becomes 3K.
Conclusion:
So, when the source is brought closer to a distance r/3, the rate of emission of electrons increases to 9N and the maximum kinetic energy of the ejected electrons becomes 3K. Therefore, the correct answer is option C: 3N, K.
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Consider a monochromatic linear source of light which is placed at a ...
Photoelectric emission rate ∝ intensity ∝ 1 /r (for linear source), maximum kinetic energy does not depend upon intensity of light. Hence, kinetic energy = k, and emission become three times.
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Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer?
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Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer?.
Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer?.
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ample number of questions to practice Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r / 3, the rate of emission and the maximum kinetic energy of photoelectron become nearlya)N / 3, 3Kb)3N, 3Kc)3N, Kd)3N, K / 3Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice NEET tests.
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