JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

1 Hard

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Application +4 | -1

A bulb emits light of wavelength

\frac{1987.8}{7} \mathrm{~nm}

. The bulb is rated as

200 \mathrm{~W}

and

14 \%

of the energy is emitted as light. How many photons are emitted by the bulb per second?

View answer and explanation

Correct option: D

4 \times 10^{19}

Option D (4 × 10¹⁹) is correct because it is calculated using the formula p = (n*hc)/(t*lambda) and considering the efficiency of the bulb.

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