Atomic sodium produces two prominent spectral lines at 588.995 nm and 589.592 nm. Find the angular separation between these lines when observed in third order using a spectrometer with 2100 lines per cm. Include proper units.

counts 300- 250- 200- 150 100- 30 *2Theta 8. A strong peak is recorded at a 20 = 28.29 degrees. Calculate d (interplanar spacing) using Bragg's Law. Assume a λ of 1.54 Å and use n=1. 9. Select a or b to make the statement true. X-ray wavelengths are a. on the same order of magnitude as atomic spacing b. much larger than atomic spacing

Which one of the following wavelengths will provide the best angular resolution? 674 nm 568 nm 596 nm 697 nm 425 nm 542 nm

option (C)

What is the minimum number of lines per cm in a 2.5 cm wide grating spectrum which will just resolve two sodium lines (5890 Å and 5896 Å) in the first order spectrum?

If the resolution of a spectrograph is∆λ = 10-12 m, would it be able to separate the Kα lines for lead and bismuth? Explain.

All X-ray diffraction structures correspond to their solution structure? True or false. Why?

Light from a slit passes through a transmission diffraction grating of 400 lines/mm, which is located 3.0 m from a screen. What are the distances on the screen (from the unscattered slit image) of the three brightest visible (fi rst-order) hydrogen lines?

Q1218 A diffracted X-ray beam is observed from the (101) plane of an iron at 2θ angle of 101.9˚. Given the wavelength of incoming X-ray used is 0.154 nm. Determine the lattice constant of iron.

Josef von Fraunhofer made the fi rst diffraction grating in 1821 and used it to measure the wavelengths of specifi c colors as well as the dark lines in the solar spectrum. His first diffraction grating consisted of 262 parallel wires. Assume that the wires were 0.20 mm apart and that Fraunhofer could resolve two spectral lines that were defl ected at angles 0.50 min of arc apart. Using this grating, what is the minimum separation (in wavelength) that can be resolved of two fi rstorder spectral lines near a wavelength of 400 nm?