JEE Main 2026 — Nuclear Physics Question with Solution
JEE Main 2026 (08 April Shift 2)
Question
Two radioactive substances A and B of mass numbers and respectively, shows spontaneous -decay with same value of MeV. The ratio of energies of -rays produced by A and B is ________.
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
In an -decay, the kinetic energy of the emitted -particle is given by the conservation of momentum and energy as:
where is the mass number of the parent nucleus.
For substance A ():
For substance B ():
The ratio of the energies of the -rays produced by A and B is:
Simplifying the fractions:
Answer:
where is the mass number of the parent nucleus.
For substance A ():
For substance B ():
The ratio of the energies of the -rays produced by A and B is:
Simplifying the fractions:
Answer:
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