Question

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

Solution

Power of the bulb = 25 watt = 25 Js^-1
$straight lambda space equals 0.57 space μm space equals space 0.57 space cross times space 10 to the power of negative 6 end exponent straight m$
Energy of one photon $straight E space equals space hv space equals straight h straight c over straight lambda$
or
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$therefore space space space Rate space of space emission space of space quanta space per space second space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator Power over denominator Energy space of space phton end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 25 space Js to the power of negative 1 end exponent over denominator 34.874 space cross times 10 to the power of negative 20 end exponent straight J end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 7.17 space cross times 10 to the power of 19 straight s to the power of negative 1 end exponent space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space$

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Structure Of Atom

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

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