Which of the following features is NOT a characteristic of natural radioactivity?
A
Radioactivity is a nuclear phenomenon
B
Radioactivity is exhibited only by elements of mass number greater than 206
C
The radioactivity of an element is affected by electric and magnetic fields in the surroundings
D
Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
E
The radioactive element is transformed into a new element
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Natural radioactivity is exhibited by elements of atomic numbers of 83 or more
Source: WAEC / JAMB / NECO Classroom Archive (Record #28658)