What type of damaging agent causes double-strand breaks in dna?

Answer: Physical agents such as X-rays and Ultraviolet light

Explanation:

Xrays and Ultraviolet (UV) rays are good examples of physical mutagens. On exposure of living cells to these physical agents, breaks are observed in the double-strand of DNA leading to serious damage and possible formation of lesion on the skin.

Thus, physical agents are very potent in damaging DNA as they cause break in the double strands