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  • If of the energy supplied to a bulb is radiated as visible light, the number of visible quanta emitted per second

If 5 \% of the energy supplied to a bulb is radiated as visible light, the number of visible quanta emitted per second by a 100 \mathrm{~W} bulb, assuming the wavelength of visible light to be 5.6 \times 10^{-5} \mathrm{~cm}, is
 

Option: 1

1.4 \times 10^{19}


Option: 2

1.4 \times 10^{20}


Option: 3

2 \times 10^{19}


Option: 4

2 \times 10^{20}


Answers (1)

best_answer

 Let the number of quanta = \mathrm{x}
\begin{aligned} & 5 \% \text { of } 100=\frac{\mathrm{nhc}}{\lambda} \\ & \Rightarrow 100 \times \frac{5}{100}=\frac{\mathrm{n} \times 6.26 \times 10^{-34} \times 3 \times 10^{-8}}{5.6 \times 10^{-7}} \\ & \Rightarrow \mathrm{n}=\frac{5}{3.35 \times 10^{-19}} \Rightarrow \mathrm{n}=1.4 \times 10^{19} \end{aligned}
 

Posted by

Pankaj Sanodiya

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