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Ncert Solutions Chemistry Class 11th Chemistry Class 11th Structure of Atoms

A 25 watt bulb emits monochromatic yellow light of wavelength 0.57 μm. Calculate the rate of emission of quanta per second.

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Payal Gupta | Contributor-Level 10

3 months ago

Energy of one photon (E) = hc / λ

= (6.626 × 10^-34 Js) x (3 × 10⁸ m s^-1) / (0.57 × 10^-6 m) = 3.48 x 10^-19J

Rate of emission of quanta per second = Power / Energy = (25 watt) / (3.48 x 10^-19 J)

= (25 Js^-1) / (3.48 x 10^-19 J) = 7.18 x 10¹⁹ s^-1

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A 25 watt bulb emits monochromatic yellow light of wavelength 0.57 μm. Calculate the rate of emission of quanta per second.

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