An electromagnetic radiation has an energy of $14.4 \text{ keV}$. To which region of the electromagnetic spectrum does it belong?

Match the electromagnetic radiations given in List-$I$ with their uses given in List-$II$.
| List-$I$ | List-$II$ |
| :--- | :--- |
| $A$) $X$-rays | $P$) Remote switches |
| $B$) $UV$-rays | $Q$) Finger prints in forensic labs |
| $C$) Radio waves | $R$) Crystal structure study |
| $D$) $IR$-rays | $S$) $TV$ communication system |

The frequencies of $X-$rays,$\gamma-$rays and ultraviolet rays are respectively $p, q$ and $r$. Then which of the following is correct?

Which of the following electromagnetic waves has the longest wavelength?

Which of the following waves are associated with communication?

Fingerprints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking at it under: