- #1

- 3

- 0

a. On average, the telescope detects 3 photons/sec from this star. What is the probability that it will detect less than three photons in an 1 second observation

I'm pretty sure I got this one, use the Poisson distribution as shown below.

P = (3^0e^(-3))/0! + (3^1e^(-3))/1! + (3^2e^(-3))/2! = 0.42

b. Another star is observed. On average, the telescope detects 1,230 photons/sec from this star. What is the probability that will detect more than 1,230 photons in any one second observation?

It is this part I am a little unsure of, I know I need to use the normal distribution but not sure how to reach from it.

Thanks in advance