cse • paper_2 • quantum_mechanics
[UPSC CSE 2020] Foundations of Quantum Mechanics (Q19, 10M)
A blue lamp emits light of mean wavelength of 4500\ \mathring{\mathrm{A}}. The rating of the lamp is 150 W and its 8% of the energy appears as light. How many photons are emitted per second by the lamp?
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