90. when cu k. x-ray with wavelength 154 a is uses, the diltraction from the (32 0) plane of a crystal occurs at, 20= 45.6. if mo k x-ray with = 0.71 a is used,

90. When Cu K. X-ray with wavelength 154 A is uses, the dilTraction from the (32 0) plane of a crystal occurs at, 20= 45.6. If Mo K X-ray with = 0.71 A is used, dilfraction from the (3 20) plane will be feund at 20 [A) 20.6 TBJ 21.6 22.8 D) 57.2