If 5% of the energy supplied to a bulb is radiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wave length of visible light as $5.6\times {10}^{-5}\mathrm{cm}?$

• A

  $1.4\times {10}^{19}$

• B

  $2\times {10}^{14}$

• C

  $1.32\times {10}^{16}$

• D

  $4.2\times {10}^{15}$