Why was "heavy" water used in the Sudbury Neutrino Observatory instead of ordinary water?
A) It is cheaper.
B) Since it is more dense, the required weight can be obtained in a smaller volume.
C) Each nucleus contains a neutron as well as a proton. Heavy water is thus a good source of neutrons.
D) Neutrons convert the "heavy" hydrogen in heavy water into helium.
Correct Answer:
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