Calculate the approximate energy (in eV) of a photon with wavelength

PHYSICS · Single correct · CBSE · Physics · Electromagnetic Waves · Electromagnetic Waves

Problem

Calculate the approximate energy (in eV) of a photon with wavelength 4.0×10−2 m4.0\times10^{-2}\,\text{m}. Based on this energy, which molecular transition is it most likely to induce? (a) 3.0×10−5 eV3.0\times10^{-5}\,\text{eV}; vibrational energy-level transition (b) 3.0×10−4 eV3.0\times10^{-4}\,\text{eV}; rotational energy-level transition (c) 3.0×10−5 eV3.0\times10^{-5}\,\text{eV}; rotational energy-level transition (d) 1.0×10−3 eV1.0\times10^{-3}\,\text{eV}; vibrational energy-level transition

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