Subject: Inorganic Chemistry · Chapter: Inorganic Spectroscopy · Topic: Inorganic Spectroscopy – General · Exam: CSIR-NET DEC 2012 · Marks: 2 · Difficulty: Medium
The recoil energy of a Mossabauer nuclide of mass 139 amu is 2.5 MeV. The energy emitted by the nucleus in keV is:
(a)12.5
(b)15.0
(c)20.5
(d)25.0
Answer
Answer (as printed): D
Explanation
Recoil energy $R$ — the book's numeric derivation here is badly OCR-corrupted (mixed stray characters and unreadable exponents) and could not be reliably reconstructed from the text alone. The legible end result reads: $24.57\times10^{3}\,\mathrm{eV} = 25\,\mathrm{keV}$.