Question

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

Explanation:

In alpha - decay, a nucleus emits an alpha particle ($^4_2$He). Here, uranium - 238 ($^{238}_{92}$U) decays into thorium - 234 ($^{234}_{90}$Th) and an alpha particle ($^4_2$He), which is characteristic of alpha decay.

Answer:

C. alpha decay