A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

Explanation

To solve the problem of calculating the number of photons emitted per second by a 100-watt bulb emitting monochromatic light of wavelength 400 nm, we can follow these steps:

### Step 1: Understand the given data
- Power of the bulb (P) = 100 watts = 100 joules/second
- Wavelength of light (λ) = 400 nm = 400 × 10^(-9) meters

### Step 2: Calculate the energy of one photon
The energy (E) of one photon can be calculated using the formula:
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