Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Photoelectric Effects and deBroglie Equation. Understanding the underlying formula is key to arriving at the correct answer below:

Number of photons per second is $n = \frac{P}{E} = \frac{P \lambda}{h c}$. Substituting the values, $n = \frac{9 \times 10^{-3} \times 667 \times 10^{-9}}{6.6 \times 10^{-34} \times 3 \times 10^8} = \frac{6003 \times 10^{-12}}{19.8 \times 10^{-26}} \approx 3 \times 10^{16}$ photons per second.