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