Nucleus: Composition, Size & Nuclear Force
Consider the following statements:
A. Atoms of each element emit characteristics spectrum.
B. According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit.
C. The density of nuclear matter depends on the size of the nucleus.
D. A free neutron is stable but a free proton decay is possible.
E. Radioactivity is an indication of the instability of nuclei.
Choose the correct answer from the options given below:
Show answer and solution
Answer: (b)
- A true: each element has its own characteristic spectrum.
- B true: Bohr's electron moves in stationary orbits.
- C false: nuclear density is independent of nuclear size.
- D false: a free neutron is unstable (half-life about 10 min); a free proton is stable.
- E true: radioactivity shows nuclear instability.
- So the answer is (b) A, B and E only.