I am trying to post a science/physics question of varying difficulty each week for this year, and maybe a monthly question of greater complexity.

The Rules are:
Answers must be complete, and each statement must be sound/logical.

More than one answer can exists, until its proven false. Hypothesis and theory varies, but scientific logic used must be sound. For example, no marks for cyclic logic. Another example, in cause and effect, no marks for declaring a cause without completely deriving that cause from a generally known and proven fact.

The better the answer, then the more points awarded. Answers can always be updated at anytime as we learn something new everyday.
(I do not claim to have THE answer. I will just attempt to provide a possible answer)

The greater the difficulty, the greater the points. I will give an answer at end of week/month ... hopefully. Repeating my answer awards no points, you will have to come with a better or alternate answer.

I emphasize that Logics is key to getting points aka "Sound logics" aka "there is no other type of logics". It is either logical or illogical. (Some people claim other forms of logic like administrative logistics which they essentially hide some of the steps because such steps are nefarious and then claim that they are using a special type of logics. That will give you zero marks here. Each step must be given) I believe that we are smart people here, so we logically know that "Many people having the same answer" does not automatic conclude, or imply, that that answer is THE answer. What can make an answer THE answer is sound logics and proven experimental tests.)

Two antennas (of slightly different tuned frequencies f1 and f2) when placed very close to each other, causes their tuned value to change. This is experimentally true. Why?

Hint: Explain what happens when a sinusoid signal of f1 is inputted onto the corresponding antenna.

P.S. I suspect the same happens with all antennas, just that the effect is usually negligible. Proximity and resonance affect the amount. I may try use this assumption to explain questions later on about quantum weirdness, by countering, as I do not suspect that Schrodinger puss is alive and dead at the same time.

Tertiary Level Physics

Site share of the week/month
Physics Girl - YouTube (one of my favorites)