Explanation
Graphite is used to slow down the neutrons.
Cyclotron is for accelerating charged particles.
There is no electron in the nucleus.
Radioactive iodine is used to diagnoses thyroid disorders
Cd and B are used as control rods.
Lead absorbs the harmful radiations.
Radioactive substances do not emit protons.
Out of the given, U – 235 is most radioactive.
Th – series is known as 4 n series.
They contain the same no. of neutrons.
β − particle is emitted from the nucleus due to conversion of a neutron into a proton.
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Equal no. of atoms of U and Pb means half of U has disintegrated.
∴ Time taken = t1/2.
As Rn belongs to Group 18 (Group ‘0’), Ra is two positions on right i.e. Group II.
As Z for M = 92, it is U.
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