Question

which of the following types of nuclear decay is represented by the equation below?
$_{92}^{238}u
ightarrow_{90}^{234}th + _{2}^{4}he$
alpha decay
beta decay
positron emission
electron capture

Explanation:

In alpha - decay, a nucleus emits an alpha particle which is a helium - 4 nucleus ($^4_2He$). In the given equation, uranium - 238 ($^{238}_{92}U$) decays into thorium - 234 ($^{234}_{90}Th$) and a helium - 4 nucleus ($^4_2He$), which is characteristic of alpha decay.

Answer:

alpha decay