Explanation:
a current meter turns with the flow of the river a stream . The current meter is used to measure water velocity is predetermined points along a marked line
N positron emission, also called positive beta decay (β+-decay), a proton in the parent nucleus decays into a neutron that remains in the daughter nucleus, and the nucleus emits a neutrino and a positron, which is a positive particle like an ordinary electron in mass but of opposite charge.
Answer:
B
Explanation:
.... I'm not sure tho.. Sry
