Concept:X-rays and gamma rays are both electromagnetic radiations, but their origins are different.
Explanation:X-rays are produced when high-speed electrons strike a metal target and lose kinetic energy.
Gamma rays are produced from the nucleus during radioactive decay or nuclear reactions.
Both travel at the speed of light and have similar ionizing ability and absorption characteristics.
So these properties do not separate them fundamentally.
The important difference lies in how each type of radiation is generated.
Therefore, the distinguishing factor between X-rays and gamma rays is their mode of production.
Answer:D. mode of production.