A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57µm. Calculate the rate of emission of quanta per second
NCERT Class XII
Chemistry - Main Course Book I
Chapter 2. Structure of Atom
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Power = 25 Watts = 25 Joules /second
λ = 0.57 μm
energy in a photon = h c / λ
Power = n * h c / λ where n = number of photons quanta emitted per second
=> 25 = n * 6.626 * 10⁻³⁴ * 2.98 * 10⁸ /0.57 * 10⁻⁶
=> n = 7.218 * 10¹⁹ per second
λ = 0.57 μm
energy in a photon = h c / λ
Power = n * h c / λ where n = number of photons quanta emitted per second
=> 25 = n * 6.626 * 10⁻³⁴ * 2.98 * 10⁸ /0.57 * 10⁻⁶
=> n = 7.218 * 10¹⁹ per second
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