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Q.65

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 230

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Short Answer

Astronomers using a -m-diameter telescope observe a distant supernova—an exploding star. The telescope’s detector records of light energy during the first 10 s. It’s known that this type of supernova has a visible-light power output of for the first 10 s of the explosion. How distant is the supernova? Give your answer in light years, where one light year is the distance light travels in one year. The speed of light is .

The distance of supernova from earth is

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Step by Step Solution

Step 1: Content Introduction

Power is the rate of doing work.

The power for is .

Hence, energy produced by supernova during explosion is

Step 2: Content Explanation

As energy absorve or emitted is directly proportional to its surface area,

assume distance between earth to supernova is d and radius of telescope is r.

One light year is the distance cover by one light year.

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