Match List - I with List - II.
| List - I | List - II |
| (A) Infra red waves | (I) Eye surgery |
| (B) Microwaves | (II) 1 nm to \( 10^{-3} \) nm |
| (C) Ultraviolet | (III) Heat waves |
| (D) X-rays | (IV) Produced by special vaccum tubes |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
The electromagnetic spectrum is divided into bands by wavelength, and each band is produced and used in its own way.
(A) Infra red waves — this matches (III) Heat waves. Infrared radiation is readily absorbed by the water molecules in most materials and raises their temperature, so it is called heat waves.
(B) Microwaves — this matches (IV) Produced by special vaccum tubes. Microwaves are produced by special vacuum tubes such as the klystron, the magnetron and the Gunn diode.
(C) Ultraviolet — this matches (I) Eye surgery. A finely focused beam of ultraviolet light from a laser is used in LASIK eye surgery to reshape the cornea.
(D) X-rays — this matches (II) 1 nm to \( 10^{-3} \) nm. The X-ray band lies between ultraviolet and gamma rays, from about 10 nm down to \( 10^{-4} \) nm, and 1 nm to \( 10^{-3} \) nm falls within it.
NCERT (2026-27):
Microwaves – “Microwaves (short-wavelength radio waves), with frequencies in the gigahertz (GHz) range, are produced by special vacuum tubes (called klystrons, magnetrons and Gunn diodes).”
Infrared Waves – “… Infrared waves are sometimes referred to as heat waves.”
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 – “Beyond the UV region of the electromagnetic spectrum lies the X-ray region. … It covers wavelengths from about 10–8 m (10 nm) down to 10–13 m (10–4 nm).”