A) A 100 watt bulb emits monochromatic light of wavelength 400nm. Calc

1.	A) A 100 watt bulb emits monochromatic light of wavelength 400nm. Calculatenumber of photon.
Answer» $\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\huge{\underline{\red{\mathfrak{♡Answer♡}}}}$ ⠀⠀⠀⠀⠀▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅ Power of the bulb = 100 watt = 100J/s ⠀⠀ Energy of one photon is E = hν = hc/λ ⠀⠀ where, h = 6.626 × $\sf{10^{-34}}$ Js, C = 3 × 10⁸ m/s ⠀⠀ Given, λ = 400NM = 400 × $\sf{10^{-9}}$ m ⠀⠀ By putting the VALUES, we get ⠀⠀ $\implies\sf{\frac{6.626~×~10^{-34}~×~3~×~10⁸}{400~×~10^{-9}}}$ ⠀⠀ E = 4.969× $\sf{10^{-19}}$ J ⠀⠀ Number of photons emitted in 1 sec × energy of one photon = power ⠀⠀ $\implies\sf{n~×~4.969~×~10^{-19}~=~100}$ ⠀⠀ $\implies\sf{n~=~\frac{100}{4.969~×~10^{-19}}}$ ⠀⠀ $\underline{\sf{\orange{n~=~ 2.012×10²⁰`photons~ per ~sec}}}$ So, option C is correct ⠀⠀⠀⠀⠀▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅