profile-img
Reshav posted an Question
August 26, 2020 • 20:15 pm 30 points
  • IIT JAM
  • Chemistry (CY)

40 cos x-rays of cuk, (wavelength 154 pm) are difracted by a set of atomic planes in a crystal in the following manner. the separation ofthe layers in the cryst

40 COS X-rays of CuK, (wavelength 154 pm) are difracted by a set of atomic planes in a crystal in the following manner. The separation ofthe layers in the crystals is 404 pm. Find the angle a along which the fist-order reflection will occur. (a) 79 (b) 450 (c) 11° (d) None of the above

2 Answer(s) Answer Now
  • 0 Likes
  • 3 Comments
  • 0 Shares
  • comment-profile-img>
    Lingareddy 1 best-answer

    nλ=2d sinΘ 1×154=2×404sin Θ SinΘ=0.190 Θ=11

  • comment-profile-img>
    Priyanshu kumar best-answer

    Option A is correct... alpha where first order reflection = 90-11=79°

  • comment-profile-img>
    Priyanshu kumar

    Reshav use braggs equation you get

    eduncle-logo-app

    Here lambda=154 pm given., d=404pm given ,n =1

    eduncle-logo-app

    n lambda=2d sin theta

    eduncle-logo-app

    sir usse 11degree aa rha hai par ans 79 degree diya hai

    eduncle-logo-app

    reflected angle you have to find na

    eduncle-logo-app

    this you get as 11° but in ques asking alpha value so see ques alpha =90-11=79°

    eduncle-logo-app

    see the theta (braggs)👆

    eduncle-logo-app

    now clear reshav??

    eduncle-logo-app

    please respond dear reshav

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers