The electromagnetic waves which can be used to destroy cancer cells are:
A. Ultraviolet Rays
B. Gamma Rays
C. Infrared Rays
D. X-Rays
E. Microwaves
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → B and D only
Cancer cells are destroyed by ionising radiation of very high photon energy, which penetrates the body and damages the cells. Of the waves listed, only X-rays and gamma rays have such energy.
A. Ultraviolet Rays — Incorrect. UV rays are absorbed in the outer layers of the skin; they are used to kill germs in water purifiers and in LASIK eye surgery, not for cancer treatment.
B. Gamma Rays — Correct. In medicine gamma rays are used to destroy cancer cells.
C. Infrared Rays — Incorrect. Infrared rays produce heating; they are used in physiotherapy, remote controls and night-vision devices.
D. X-Rays — Correct. Besides diagnosis, X-rays are used as a treatment for certain forms of cancer.
E. Microwaves — Incorrect. Microwaves are used in radar, communication and microwave ovens.
NCERT (2026-27):
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”
Gamma Rays – “… They are used in medicine to destroy cancer cells.”