The diagram shows the regions of the electromagnetic spectrum ordered by increasing frequency from left to right.
| Radio Waves | P | Infrared | Visible Light | Q | X-rays | R |
|---|---|---|---|---|---|---|
| Lowest frequency | Highest frequency |
Which row correctly identifies the parts P, Q and R of the electromagnetic spectrum?
P: ultraviolet, Q: microwaves, R: gamma rays
P: microwaves, Q: ultraviolet, R: gamma rays
P: microwaves, Q: gamma rays, R: ultraviolet
P: infrared, Q: ultraviolet, R: gamma rays