Physics Problem: Intensity of a Supernova

The star can be seen by the human eye if it has an intensity of 10^-7 Watt/m^2. A visible supernova occurs 55 million light years away from us. What is the minimum power output for this event?
I'm working through chapter summaries for introductory physics (algebra-based). I'm using the Openstax online (free) textbook College Physics. You can access this book here openstax.org/d...
Here is the playlist with all the videos and problems for this course.
• Online Physics 2 2024

[@fizixx]

These simple applications are some of the best ones.

[@williamperez-hernandez3968]

Forgot that R=55 Mly, so R=5.2X10^23 m. Thus P=3.4x10^41 Watt.

[@mlb9081]

Sir, Could you show how to calculate the acceptance angle for fiber cables in optics? With und without a cladding

[@brookestephen]

NOPE - 55e6 LY not 1 LY you only made the calculation for 1 LY not 55 million LY you may want to film this one again!!!