JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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A laser used to read CDs emits red light of wavelength 700 nm. How many photons does it emit each second if its power is 1.0 W?

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Correct option: D

3.52 \times 10^{18} \mathrm{~s}^{-1}

Option D (

3.52 \times 10^{18} \mathrm{~s}^{-1}

) is correct because it is the number of photons emitted per second calculated using the given power and wavelength of the laser.

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n^{\text {th }}

\mathrm{A}

\times 10^{12}

\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

\ell = 1,\,\,m = 0

1.25 \times {10^{ - 13}} \times {A^{1/3}}\mathrm{cm}.