Multiple choice

When 92U238 changes to 82Pb206 , how many alpha and beta particles are emitted respectively?

  1. 6, 8

  2. 8, 6

  3. 9, 9

  4. 4, 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This sum has been solved as follows: suppose x is the number of alpha and y is the number of beta particles emitted. This can be represented as 92U238 ---------------> 82Pb206 + x 2He4 + y -1e0 . Equating mass number on both the sides, we have 238 = 206 + 4x + 04x = 32 or x = 8. Similarly 92 = 82 +2x -yy = 98 - 92 = 6. However, calculation mistakes are not ruled out.

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