[luk32]

I highly doubt that cpu is the emitter. More probable is some long path on mother board, used for data communication.

[lovelearning]

Yes, it's the bus traces between CPU and RAM. From linked paper: "When data is exchanged between the CPU and the RAM, radio waves are emitted from the bus's long parallel circuits."

[godelmachine]

The CPU is comprised of millions / billions of transistors which switch on and off multiple times (which depends on the base clock frequency).