In neutron moisture meter energy of thermalized electron is

Answer: Option C

A neutron moisture meter is a moisture meter utilizing neutron scattering. The meters are most frequently used to measure the water content in soil or rock.
Water due to its hydrogen content, is an effective neutron moderator, sowing high-energy neutrons. With a source of high-energy neutrons and a detector sensitive to low-energy neutrons, the detection rate will be governed by the water content of the soil between the source and the detector.
In a neutron moisture meter, the energy of the thermalized electron is 0.03 eV.