Being on the same wavelength

Solution 1:

being on the same wavelength is hardly "physics terminology" or limited to "technically minded people". Anyone who wished to listen to a radio program had to turn the dial until the receiver was on the same wavelength as the station broadcasting the program.

on the same wavelength
In complete accord, in rapport, as in Conductor, orchestra members, soloists, and chorus all were on the same wavelength, making for a wonderful performance . This term alludes to radio waves that carry a broadcast. [First half of 1900s]
American Heritage® Dictionary of Idioms

Solution 2:

Yes, the origin is from an analogy with electromagnetic waves used in radio transmissions:

wavelength:

• o wave-length, 1850, "distance between peaks of a wave," from wave (n.) + length. Originally of spectra; radio sense is attested by 1925.

• Figurative sense of "mental harmony" is recorded from 1927, on analogy of radio waves.

(Etymonline)

In the following link below you can find other idiomatic expressions related to scientific contexts such as:

:

• A good example of a science-oriented idiom would be to “blind someone with science” which means to confuse someone with language that is highly technical. Another would be “to have something down to a science” which means something is totally understood and managed extremely well. Let’s look at more idioms that refer to science and some that are included in science jargon.

(Dictionary.com)