The process of beta plus (β⁺) decay can be represented by
n → p + X + Y + β⁺
Which row identifies particles X and Y? - AQA - A-Level Physics - Question 8 - 2019 - Paper 1
Question 8
The process of beta plus (β⁺) decay can be represented by
n → p + X + Y + β⁺
Which row identifies particles X and Y?
Worked Solution & Example Answer:The process of beta plus (β⁺) decay can be represented by
n → p + X + Y + β⁺
Which row identifies particles X and Y? - AQA - A-Level Physics - Question 8 - 2019 - Paper 1
Step 1
Identify Particle X
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
In beta plus decay, a proton (p) is formed from a neutron (n), with the emission of a positron (β⁺) and a neutrino. Therefore, particle X is identified as the W⁺ boson, which mediates the weak force in this decay process.
Step 2
Identify Particle Y
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Particle Y is the neutrino (νₑ), which is also emitted during beta plus decay to conserve energy and momentum.
Step 3
Final Identification
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Considering that X = W⁺ and Y = νₑ, the correct row identifying particles X and Y is B: X = W⁺ and Y = νₑ.
