Only a fraction of the electric energy supplied to a tungsten lightbulb is converted to visible light. The rest of the energy shows up as infrared radiation (i. e., heat). A 25−W lightbulb converts 15.0 percent of the energy supplied to it into visible light (assume the wavelength to be 505 nm). How many photons are emitted by the light bulb per second (1 W = 1 J / s)

The value is  

Explanation:

From the question we are told that

  The power rating of the bulb is  P  =  25 W    

   The efficiency is

     The wavelength is

Generally the energy of the photon emitted is mathematically represented as

Here  h is the planks constant  with a value  

         c is the speed of light with value  

So

=>      

=>      

Generally we are told that 1 W =  1 J/s  

  Hence  25 W  =  25 J  

Generally the amount of this energy converted to light is  

Generally the number of photons that are emitted by the light bulb per second  is mathematically represented as

=>  

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explanation: