Match List - I with List - II.
| List – I | List – II | ||
|---|---|---|---|
| (A) | To study crystal structure | (I) | IR ray |
| (B) | To study structure of nuclei | (II) | X-ray |
| (C) | Take haze photography | (III) | UV-ray |
| (D) | Can cause fluorescence | (IV) | γ-ray |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
Each use of electromagnetic waves follows from the wavelength or the energy of that region of the spectrum.
(A) To study crystal structure — this matches (II) X-ray. The wavelength of X-rays (about 0.1 nm) is of the order of the spacing between atoms in a crystal, so crystals diffract them.
(B) To study structure of nuclei — this matches (IV) γ-ray. Gamma rays come from transitions between energy levels of the nucleus, so their energies carry information about nuclear structure.
(C) Take haze photography — this matches (I) IR ray. Infrared is scattered much less by haze and fog than visible light, so it can photograph through them.
(D) Can cause fluorescence — this matches (III) UV-ray. Ultraviolet photons carry enough energy to excite many substances, which then re-emit visible light.