Question

The first `-` order diffraction os `X-` rays from a certain set of crystal planes occurs an angle of `11.8^(@)` from the planes. If the planes are `0.281 nm` apart, what is the wavelength of `X-` rays?

Answer 1

`nlambda=2dsintheta`
`(` Given`:n=1,d=0.281xx10^(-9)m,theta=11.8^(@))`
`:.lambda=(2xx0.281xx10^(-9)xxsin11.8)/(1)`
`=2xx0.281xx10^(-9)0.2044=0.1149nm`