Q.41

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Found in: Page 1060

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

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# A modest supernova (the explosion of a massive star at the end of its life cycle) releases 1.5 * 1044 J of energy in a few seconds. This is enough to outshine the entire galaxy in which it occurs. Suppose a star with the mass of our sun collides with an antimatter star of equal mass, causing complete annihilation. What is the ratio of the energy released in this star-antistar collision to the energy released in the supernova?

The ratio of the energy released in this star-antistar collision to the energy released in the supernova 2400.

See the step by step solution

## Given information

We have given that, a modest supernova (the explosion of a massive star at the end of its life cycle) releases 1.5 * 1044 J of energy in a few seconds. This is enough to outshine the entire galaxy in which it occurs. Suppose a star with the mass of our sun collides with an antimatter star of equal mass, causing complete annihilation.

## Step 1.

All the mass will be converted in energy in the collision.

We can write it as .

Here, E = energy

m = mass

c = speed of light

## Step 2.

We have given that mass of star and anti star is equal to the mass of Sun.

So, the energy given in star and anti star collision is :

here, E = energy

= mass of sun

c = speed of light

Substituting the values in energy formula :

The ratio of the energy released in this star-antistar collision to the energy released in the supernova :

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