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Questions  >>  SAT  >>  Chemistry  >>  Atomic Structure
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A bulb emits light of wavelength $4500\;A$ . The bulb is rated as $150\;walt$ and $8\%$ of the energy is emitted as light. How many photons are emitted by the bulb per second .

$\begin{array}{1 1} (a)\; 2.715 \times 10^{19} \\(b)\; 1.715 \times 10^{19} \\ (c)\; 3.715 \times 10^{19} \\ (d)\; 4.715 \times 10^{19} \end{array} $

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