The longest wavelength that can be analysed by a sodium chloride crystal of spacing `d = 2.82 Å` in the second order is -

Give the wavelengths of D_1 and D_2 lines of sodium.

In Fresnel's biprism experiment, the source contains two wavelength 6000 Å and 5000 Å. The fourth order bright fringe of first wavelength is at a distance of 3 mm from the central band. The distance of the same order of bright band of second wavelength from the central band is

An X-ray beam of wavelength 1.0Å is incident on a crystal of lattice spacing 2.8 Å . Calculate the value of Bragg angle for first order of diffraction.

How many chloride ions are there around sodium ion in sodium chloride crystal? (a) 4 (b) 8 (c) 6 (d) 12

A beam of monochromatic light of wavelength lambda falls normally on a diffraction grating of line spacing d. If theta is the angle between the second-order diffracted beam and the direction of the incident light, what is the value of sin theta ?