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A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, then
  • a)
    number of electrons emitted is a quarter of the initial number
  • b)
    each emitted electron carries one quarter of the initial energy
  • c)
    number of electrons emitted is half the initial number
  • d)
    each emitted electron carries half the initial energy
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A photoelectric cell is illuminated by a point source of light 1 m aw...
Power ? no. of electrons emitted (N)
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Read the following text and answer the following questions on the basis of the same:Electron Microscope Electron microscopes use electrons to illuminate a sample. In Transmission Electron Microscopy (TEM), electrons pass through the sample and illuminate film or a digital camera.Resolution in microscopy is limited to about half of the wavelength of the illumination source used to image the sample. Using visible light the best resolution that can be achieved by microscopes is about ~200 nm. Louis de Broglie showed that every particle or matter propagates like a wave. The wavelength of propagating electrons at a given accelerating voltage can be determined byThus, the wavelength of electrons is calculated to be 3.88 pm when the microscope is operated at 100 keV, 2. 74 pm at 200 keV and 2.24 pm at 300 keV. However, because the velocities of electrons in an electron microscope reach about 70% the speed of light with an accelerating voltage of 200 keV, there are relativistic effects on these electrons. Due to this effect, the wavelength at 100 keV, 200 keV and 300 keV in electron microscopes is 3.70 pm, 2.51 pm and 1.96 pm, respectively.Anyhow, the wavelength of electrons is much smaller than that of photons (2.5 pm at 200 keV). Thus if electron wave is used to illuminate the sample, the resolution of an electron microscope theoretically becomes unlimited. Practically, the resolution is limited to ~0.1 nm due to the objective lens system in electron microscopes. Thus, electron microscopy can resolve subcellular structures that could not be visualized using standard fluorescence microscopy.Q. Wavelength of electron as wave at accelerating voltage 200 keV is

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A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, thena)number of electrons emitted is a quarter of the initial numberb)each emitted electron carries one quarter of the initial energyc)number of electrons emitted is half the initial numberd)each emitted electron carries half the initial energyCorrect answer is option 'A'. Can you explain this answer?
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A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, thena)number of electrons emitted is a quarter of the initial numberb)each emitted electron carries one quarter of the initial energyc)number of electrons emitted is half the initial numberd)each emitted electron carries half the initial energyCorrect answer is option 'A'. 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 A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, thena)number of electrons emitted is a quarter of the initial numberb)each emitted electron carries one quarter of the initial energyc)number of electrons emitted is half the initial numberd)each emitted electron carries half the initial energyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, thena)number of electrons emitted is a quarter of the initial numberb)each emitted electron carries one quarter of the initial energyc)number of electrons emitted is half the initial numberd)each emitted electron carries half the initial energyCorrect answer is option 'A'. Can you explain this answer?.
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