Question

The difference between the wavelengths of the Stokes line and Anti-Stokes lines in the Raman spectrum of H−Br molecule is 100Å.The difference between the wavelengths of the Stokes line and Anti-Stokes lines in the Raman spectrum of H−Br molecule is 100Å. If the wavelength of the Anti-Stokes line is 5000Å, the wavelength of the incident radiation is:
A. 5050Å
B. 4950Å
C. 5100Å
D. 4900Å

Answer 1

Hint: Stokes and anti-stokes lines are symmetrical about the main line. Here it is mentioned that the difference between stokes line and its corresponding anti stokes line is 100Å and the difference between the anti-stokes line and main will be 50Å. The wavelength of anti-stokes line is smaller than the main line. Using this way we can reach in to answer.

Complete step-by-step answer:
Stokes lines are the radiation of certain wavelengths present in the line spectra which is associated with phenomena of fluorescence and the Raman Effect .These lines are named after a 19th-century British physicist Sir George Gabriel Stokes.
Anti Stokes lines are the lines which are associated with phenomena of fluorescence and the Raman Effect which are formed when the atoms or molecules in a material are already in its excited state. The frequency or the wavelength difference between the emitted and absorbed light is called the Stokes shift. Stokes and antistokes lines are symmetrical about the main line. Here it is mentioned that the difference between stokes line and its corresponding anti stokes line is 100Å.and the difference between the anti stokes line and main will be 50Å. The wavelength of the anti-stroke line is smaller than the main line. Finding this way, the solution will be option A.

Note: Stokes lines are the radiation of certain wavelengths present in the line spectra which is associated with phenomena of fluorescence and the Raman Effect The difference between the anti-stokes line and main will be 50Å.