When cathode rays strike a target of high atomic weight, they give rise to A. alpha-rays B. beta and gamma rays C. X-rays D. Positive rays

The correct answer is C. X-rays.

When cathode rays strike a target of high atomic weight, they give rise to X-rays. This is because the high-energy electrons from the cathode rays interact with the atoms in the target, causing them to emit X-rays.

Alpha-rays are helium nuclei, which are made up of two protons and two neutrons. Beta-rays are electrons, and gamma-rays are high-energy photons. Positive rays are made up of protons, which are positively charged particles.

X-rays are a type of electromagnetic radiation with a wavelength shorter than that of visible light. They are used in a variety of medical and industrial applications, such as X-ray imaging and radiography.