Electromagnetic Spectrum

Let's match each type of wave to its approximate frequency range:
- Radio waves (A): Radio waves generally have a frequency range from to Hz. This corresponds to option (R).
- Microwaves (B): Microwaves typically range from to Hz. This corresponds to option (S).
- Infrared (C): Infrared waves have a frequency range from to Hz. This corresponds to option (Q).
- X-rays (D): X-rays have a frequency range of to Hz. This corresponds to option (Q).

Thus, the correct matching is (A)-(R) (B)-(S) (C)-(Q) (D)-(Q), which corresponds to answer choice B.