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(C) The power of the bulb is $P = 50 \, W = 50 \, J \cdot s^{-1}$.The energy of one photon is given by $E = \frac{hc}{\lambda}$.Substituting the given

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$2$

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(C) The power of the bulb is $P = 50 \, W = 50 \, J \cdot s^{-1}$.The energy of one photon is given by $E = \frac{hc}{\lambda}$.Substituting the given values: $E = \frac{6.63 	imes 10^{-34} \, J \cdot s 	imes 3.0 	imes 10^{8} \, m \cdot s^{-1}}{795 	imes 10^{-9} \, m} = 2.5018 	imes 10^{-19} \, J$.The number of photons emitted per second $(n)$ is given by $n = \frac{P}{E}$.$n = \frac{50}{2.5018 	imes 10^{-19}} \approx 1.998 	imes 10^{20}$.Given that $n = x 	imes 10^{20}$,we have $x \approx 2$.

$A$ $50 \, W$ bulb emits monochromatic red light of wavelength $795 \, nm$. The number of photons emitted per second by the bulb is $x \times 10^{20}$. The value of $x$ is $......$.
$[ \text{Given} : h=6.63 \times 10^{-34} \, J \cdot s \text{ and } c=3.0 \times 10^{8} \, m \cdot s^{-1} ]$

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$A$ $50 \, W$ bulb emits monochromatic red light of wavelength $795 \, nm$. The number of photons emitted per second by the bulb is $x \times 10^{20}$. The value of $x$ is $......$.$[ \text{Given} : h=6.63 \times 10^{-34} \, J \cdot s \text{ and } c=3.0 \times 10^{8} \, m \cdot s^{-1} ]$