   Chapter 34, Problem 12PE

Chapter
Section
Textbook Problem

(a) A particle and its antiparticle are at rest relative to an observer and annihilate (completely destroying both masses), creating two (rays of equal energy. What is the characteristic (−ray energy you would look for if searching for evidence of proton−antiproton annihilation? (The fact that such radiation is rarely observed is evidence that here is very little antimatter in the universe.) (b) How does this compare with the 0.511−MeV energy associated with electron−positron annihilation?

To determine

(a)

The characteristic γ rays energy.

Explanation

Given data:

Mass of proton is mp=1.67×1027kg.

Velocity of light is c=3×108m/s.

Formula used:

The γ emitted through proton antiproton annhilation. Therefore mass energy is equal to proton.

The formula to calculate enegry is,

E=mpc2   .........(1)

Calculation:

Substitute the given value in equation (1).

E=1.67×1027(3.0× 10 8m/s)2=15

To determine

(b)

The comprision between proton antiproton annihilation and electron positron annihilation.

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