The process of positron emission can be considered as the
A) conversion of a neutron to a proton and a positron. The positron is emitted.
B) conversion of a neutron to a proton and an electron. The electron is emitted.
C) conversion of a proton to a neutron and a positron. The neutron is emitted.
D) conversion of a proton to an neutron and a positron. The positron is emitted.
Question 2
Petroleum is best described as a
A) pure substance.
B) compound.
C) simple mixture.
D) complex mixture.