Calculating Energy from Intensity: A Super Nova Scenario

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Homework Help Overview

The problem involves calculating the energy received from a supernova explosion, given its total energy output and distance from Earth. The context is astrophysics, focusing on energy distribution and intensity over a specified area.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the relationship between intensity and energy, with one attempting to apply the formula I=P/A to find intensity, while others question the relevance of this equation given the total energy provided.

Discussion Status

The discussion is active, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the use of equations, though no consensus has been reached on the correct approach to connect energy and intensity.

Contextual Notes

There is uncertainty regarding the appropriate equations to use, particularly in distinguishing between total energy and power. Participants express a need to clarify assumptions about energy distribution.

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Homework Statement


A super nova releases 2.0×1045 J of energy. It is 1500 ly from earth. If you were facing the star in question, and your face was a circle 7 cm in radius, how much energy would reach your face?


Homework Equations


I=P/A


The Attempt at a Solution


I used I=P/A to get the intensity of the sun at the point of the face, but was unsure of how to use that number to determine the energy on 'my' face.
 
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Assume that the energy is uniformly distributed over the face of a sphere of radius 1500 ly.
 
but which equation would connect the energy to the intensity? =/
 
I = P / A isn't relevant here. You are given the total energy released, not the power (rate of energy release).
 
oh, well I feel silly.
hopefully I can find the equation I should use in my book.
 

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