A bulb emits light of wavelength . The bulb is rated as and of the energy is emitted as light. How many photons are emitted by the bulb per second?
Step 1: Given data
Step 2: Concept and formulae
Step 3: Finding the number of photons
Let n number of photons being emitted per second by the bulb.
Considering is the velocity of light in free space and is the Plank constant.
The energy emitted by the bulb is,
The energy of 1 photon is,
According to question light(photon) energy = 12 joule,
Therefore, the number of photons emitted by the bulb is