Two gamma photons are produced when a muon and an antimuon annihilate each other - AQA - A-Level Physics - Question 10 - 2018 - Paper 1
Question 10
Two gamma photons are produced when a muon and an antimuon annihilate each other.
What is the minimum frequency of the gamma radiation that could be produced?
Worked Solution & Example Answer:Two gamma photons are produced when a muon and an antimuon annihilate each other - AQA - A-Level Physics - Question 10 - 2018 - Paper 1
Step 1
Identify the Energy Released
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Answer
The annihilation of a muon and an antimuon produces two gamma photons. According to the principles of energy conservation in particle physics, the energy of the annihilated particles is converted into the energy of the photons. We can use the mass-energy equivalence formula:
E=mc2
where m is the mass of the muon and antimuon, and c is the speed of light.
Step 2
Calculate the Frequency of the Gamma Radiation
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Answer
The energy of a photon can also be expressed as:
E=hf
where h is Planck's constant and f is the frequency of the photon. To find the minimum frequency, we can equate the energy of the photons produced with the energy released during annihilation:
hf=2mc2
Thus, the frequency is given by:
f=h2mc2
By substituting the mass of the muon (which is approximately 1.88×10−28 kg) and known constants, we can calculate the minimum frequency.
Step 3
Select the Correct Answer
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Answer
After performing the calculations, we find that the minimum frequency of the gamma radiation that could be produced is 5.10×1016Hz. Therefore, the correct answer is: