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A beam of electrons striking a copper target produces X-rays.Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparision with old as :    
  • a)
    Cut-off wavelength will remain unchanged while characteristic lines will be different.
  • b)
    Both cut-off wavelength and characteristic lines will remain unchanged.
  • c)
    Both cut-off wavelength and characteristic lines will be different.
  • d)
    Cut-off wavelength will be different while characteristic lines will remain unchanged.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A beam of electrons striking a copper target produces X-rays.Its spect...
Cut- off wavelength of emitted X-rays depends on maximum kinetic energy of incident electrons on the target and is independent of nature of target. The characteristic lines depend on nature of material of target.
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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 beam of electrons striking a copper target produces X-rays.Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparision with old as : a)Cut-off wavelength will remain unchanged while characteristic lines will be different.b)Both cut-off wavelength and characteristic lines will remain unchanged.c)Both cut-off wavelength and characteristic lines will be different.d)Cut-off wavelength will be different while characteristic lines will remain unchanged.Correct answer is option 'A'. Can you explain this answer?
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A beam of electrons striking a copper target produces X-rays.Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparision with old as : a)Cut-off wavelength will remain unchanged while characteristic lines will be different.b)Both cut-off wavelength and characteristic lines will remain unchanged.c)Both cut-off wavelength and characteristic lines will be different.d)Cut-off wavelength will be different while characteristic lines will remain unchanged.Correct 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 beam of electrons striking a copper target produces X-rays.Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparision with old as : a)Cut-off wavelength will remain unchanged while characteristic lines will be different.b)Both cut-off wavelength and characteristic lines will remain unchanged.c)Both cut-off wavelength and characteristic lines will be different.d)Cut-off wavelength will be different while characteristic lines will remain unchanged.Correct 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 beam of electrons striking a copper target produces X-rays.Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparision with old as : a)Cut-off wavelength will remain unchanged while characteristic lines will be different.b)Both cut-off wavelength and characteristic lines will remain unchanged.c)Both cut-off wavelength and characteristic lines will be different.d)Cut-off wavelength will be different while characteristic lines will remain unchanged.Correct answer is option 'A'. Can you explain this answer?.
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