AIIMS 2019 Chemistry Photon Emission MCQ Question

To find the number of photons (n) emitted, we use the equation $E = \frac{nhc}{\lambda}$, where $E$ is the energy of the emitted photons, $h$ is Planck's constant ($6.626 \times 10^{-34} \, \text{Js}$), $c$ is the speed of light ($3.00 \times 10^8 \, \text{m/s}$), and $\lambda$ is the wavelength of the emitted light. Substituting the given values into the equation and solving for $n$ yields a value of 1, confirming that only one photon is emitted. Options B (2), C (3), and D (4) are incorrect as they imply a higher number of photons emitted, which does not align with the calculated energy output based on the provided parameters.