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Question: 

A ${^{238}_{92}\textrm{U}}$ nucleus emits an $\alpha$ particle with kinetic = 4.20 MeV.

  1. What is the daughter nucleus, and
  2. what is the approximate atomic mass (in u) of the daughter atom? Ignore recoil of the daughter nucleus.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. ${}^{238}U \longrightarrow {}^{234}Th + {}^4He$
  2. $234.04368 \textrm{ u}$

Giancoli 7th Edition, Chapter 30, Problem 28

(3:50)

Chapter 30, Problem 28 is solved.

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