Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ruby negi
use formula 2dsin(theta/2)=wavelength... where wavelength and theta is given, d=a/√2 and a is lattice parameter... use these, u will get ur answer..
yess I exctly use this formula...but I didn't get the answer
did u use theta/2
u have to use theta 20 as it is given.. then u will get .31nm which is a right answer..