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A parallel beam of fast moving electrons isincident normally on a narrow slit. A fluorescentscreen is placed at a large distance from the slit.If the speed of the electrons is increased, whichof the following statements is correct ?              [NEET 2013]
  • a)
    The angular width of the central maximumof the diffraction pattern will increase.
  • b)
    The angular width of the central maximumwill decrease.
  • c)
    The angular width of the central maximumwill be unaffected.
  • d)
    Diffraction pattern is not observed on thescreen in case of electrons.
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
A parallel beam of fast moving electrons isincident normally on a narr...
If the speed will increase then the angular width of central maximum will decrease as speed is inversely proportional to wavelength, so as wavelength decreases the angular width also decreases.
angular width =wavelength/distance between the slits.
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Read the following text and answer the following questions on the basis of the same:Diffraction in a hall:A and B went to purchase a ticket of a music programme. But unfortunately only one ticket was left. They purchased the single ticket and decided that A would be in the hall during the 1st half and B during the 2nd half.Both of them reached the hall together. A entered the hall and found that the seat was behind a pillar which creates an obstacle. He was disappointed. He thought that he would not be able to hear the programme properly.B was waiting outside the closed door. The door was not fully closed. There was a little opening.But surprisingly, A could hear the music programme.This happened due to diffraction of sound.The fact we hear sounds around corners and around barriers involves both diffraction and reflection of sound.Diffraction in such cases helps the sound to "bend around" the obstacles.In fact, diffraction is more pronounced with longer wavelengths implies that we can hear low frequencies around obstacles better than high frequencies.B was outside the door. He could also hear the programme. But he noticed that when the door opening is comparatively less he could hear the programme even being little away from the door. This is because when the width of the opening is larger than the wavelength of the wave passing through the gap then it does not spread out much on the other side. But when the opening is smaller than the wavelength more diffraction occurs and the waves spread out greatly – with semicircular wavefront. The opening in this case functions as a localized source of sound.Q. Diffraction of sound takes place more when

A parallel beam of fast moving electrons isincident normally on a narrow slit. A fluorescentscreen is placed at a large distance from the slit.If the speed of the electrons is increased, whichof the following statements is correct ? [NEET 2013]a)The angular width of the central maximumof the diffraction pattern will increase.b)The angular width of the central maximumwill decrease.c)The angular width of the central maximumwill be unaffected.d)Diffraction pattern is not observed on thescreen in case of electrons.Correct answer is option 'B'. Can you explain this answer?
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A parallel beam of fast moving electrons isincident normally on a narrow slit. A fluorescentscreen is placed at a large distance from the slit.If the speed of the electrons is increased, whichof the following statements is correct ? [NEET 2013]a)The angular width of the central maximumof the diffraction pattern will increase.b)The angular width of the central maximumwill decrease.c)The angular width of the central maximumwill be unaffected.d)Diffraction pattern is not observed on thescreen in case of electrons.Correct answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A parallel beam of fast moving electrons isincident normally on a narrow slit. A fluorescentscreen is placed at a large distance from the slit.If the speed of the electrons is increased, whichof the following statements is correct ? [NEET 2013]a)The angular width of the central maximumof the diffraction pattern will increase.b)The angular width of the central maximumwill decrease.c)The angular width of the central maximumwill be unaffected.d)Diffraction pattern is not observed on thescreen in case of electrons.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A parallel beam of fast moving electrons isincident normally on a narrow slit. A fluorescentscreen is placed at a large distance from the slit.If the speed of the electrons is increased, whichof the following statements is correct ? [NEET 2013]a)The angular width of the central maximumof the diffraction pattern will increase.b)The angular width of the central maximumwill decrease.c)The angular width of the central maximumwill be unaffected.d)Diffraction pattern is not observed on thescreen in case of electrons.Correct answer is option 'B'. Can you explain this answer?.
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