MCQ
A $50\, watt$ bulb emits monochromatic red light of wavelength of $795\, \mathrm{~nm}$. The number of photons emitted per second by the bulb is $\mathrm{x} \times 10^{20}$. The value of $\mathrm{x}$ is ...... .
$\left[\right.$ Given $: \mathrm{h}=6.63 \times 10^{-34} \,\mathrm{Js}$ and $\left.\mathrm{c}=3.0 \times 10^{8} \,\mathrm{~ms}^{-1}\right]$
- A$1$
- B$4$
- ✓$2$
- D$3$
