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Number of photons emitted by 10 W sodium vapour lamp in 10 second is : (Assume that 60% of energy is converted into light. Wavelength of sodium light = 390 nm)

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$3 .4 \times 10^{19}$

$1 .18 \times 10^{20}$

$3 .4 \times 10^{18}$

$1 .77 \times 10^{18}$

answer is A.

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Detailed Solution

$\begin{array}{l} nhv = \frac{100 \times 60}{100} = 60 J \\ n = \frac{60 λ}{hc} = \frac{62 \times 3 .9 \times 10^{- 7}}{6 .63 \times 10^{- 34} \times 3 \times 10^{8}} = 1 .18 \times 10^{20} \end{array}$

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