Question

1.0x 10¹⁰ photons pass through an experimental apparatus. How many of them land in a 0.10-mm-wide strip where the probability density is 20 m^-1?

Short answer

Thus, the number of photons that will land in 0.10 mm wide strip is$2.0\times {10}^7\text{photons}$

Step-by-step solution

Given information

1.0x 10¹⁰ photons pass through an experimental apparatus.

Explanation

The number of photons that will land in 0.10 mm wide strip is:

$N=p\left(x\right)\times \delta x\times N_0$

Where,

p(x) is probability density

$\delta x$is the width of strip

$N_o$is the total number of photons

Substituting the values:

role="math" localid="1648589073680" $$\begin{gathered} N=20\times 0.1\times {10}^{-3}\times 1.0\times {10}^{10} \\ N=2.0\times {10}^7\text{photons} \end{gathered}$$