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27 A 100 W sodium street lamp emits yellow light of wavelength 0 6 m...

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27 A 100 W sodium street lamp emits yellow light of wavelength 0 6 m If it converts 40 of electrical energy into light then the number of photons of yellow light it emits per second is 1 1 2 x 1019 2 2 2 x 1019 3 1 2 x 1020 AY 20

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