Match List I with List - II.
| List – I | List – II |
| (A) \( \gamma \)-rays | (I) To detect bone fractures |
| (B) Infrared rays | (II) Chemotherapy |
| (C) Ultraviolet rays | (III) Eye-Surgery |
| (D) X-rays | (IV) Heat therapy |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
Each band of the electromagnetic spectrum has its uses, decided by how much energy its photons carry and how it interacts with the body.
(A) \( \gamma \)-rays — this matches (II) Chemotherapy. Gamma rays carry the most energy and can destroy cancer cells, so they are used in the treatment of cancer; this is the cancer-treatment entry of List-II.
(B) Infrared rays — this matches (IV) Heat therapy. Infrared radiation is readily absorbed by the water molecules of the body and raises its temperature, which is why infrared lamps are used in physical therapy.
(C) Ultraviolet rays — this matches (III) Eye-Surgery. Very narrow, focused beams of UV radiation are used in LASIK eye surgery to reshape the cornea with great precision.
(D) X-rays — this matches (I) To detect bone fractures. X-rays pass through soft tissue but are absorbed strongly by bone, so a fracture shows up on an X-ray image.
NCERT (2026-27):
Gamma Rays – “… They are used in medicine to destroy cancer cells.”
Infrared Waves – “… Infrared lamps are used in physical therapy.”
Ultraviolet Rays – “… Due to its shorter wavelengths, UV radiations can be focussed into very narrow beams for high precision applications such as LASIK (Laser- assisted in situ keratomileusis) eye surgery.”
X-Rays – “… X-rays are used as a diagnostic tool in medicine and as a treatment for certain forms of cancer.”