OnlineCBT
Chemistry · Structure of atom
हिन्दीA 100 watt bulb emits monochromatic light of wavelength \( 400 \text{ nm} \). Calculate the number of photons emitted per second by the bulb.
Correct answer · Option 3
\( 2.012 \times 10^{20} \text{ s}^{-1} \)
Explanation
Energy of one photon \( E = \frac{hc}{\lambda} = 4.969 \times 10^{-19} \text{ J} \). Number of photons per second = \( \frac{100 \text{ J s}^{-1}}{4.969 \times 10^{-19} \text{ J}} = 2.012 \times 10^{20} \text{ s}^{-1} \).
