Using Bragg reflection, X rays are reflected from a crystal with a known structure. The crystal's density is measured with an RMS error of 3 parts in 104 , and the angle between the incident and reflected rays with the crystal plane is 6∘ , measured with an RMS error of 3.4 minutes of arc. Calculate the RMS error in determining the wavelength of the X rays.
1
0.89%.
2
0.90%.
3
0.94%.
4
0.99%.