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CSE · Paper II · Quantum Mechanicscse-2020-subject-05-002

Mean wavelength — UPSC Physics Optional CSE 2020 Paper II

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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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