http://imagine.gsfc.nasa.gov/YBA/HTCas- ... ength.html
![Question :?:](./images/smilies/icon_question.gif)
step by step procedure will be very helpful
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)
I'd calculate the photon density at 140 pc, 1e32 photons / 2.34e38 m^2 = 4e-7 photons/m^2ritwik wrote:question is on the page below ↓
http://imagine.gsfc.nasa.gov/YBA/HTCas- ... ength.html :?:
step by step procedure will be very helpful.
I made the same mistake at first. They require you to round to the nearest whole number, which is 0 in this case. Still, I would prefer that they accept 0.003 as well.Chris Peterson wrote:[...] return signal of 0.003 photons for a single 1e32 photon isotropic pulse.
The site doesn't like that answer, so either the site is wrong, or I'm misunderstanding the question
Ha. Borderline trick question. Funny thing is that I tried a couple of alternatives based on possible errors- using one parsec, forgetting to square the radius, and got larger numbers... which I did round to the nearest whole number.Markus Schwarz wrote:I made the same mistake at first. They require you to round to the nearest whole number, which is 0 in this case. Still, I would prefer that they accept 0.003 as well.Chris Peterson wrote:[...] return signal of 0.003 photons for a single 1e32 photon isotropic pulse.
The site doesn't like that answer, so either the site is wrong, or I'm misunderstanding the question