Question about Hz difference between MacBook Pro and iMac?

Some will think I'm crazy for saying this, but my new MacBook is driving me nuts.
In a nutshell, I have tinnitus as a result of an accident some years ago. I can hear an intermittent high pitch sound coming from the back left of the machine. I used to hear a similar sound from old TVs back when I first got tinnitus. After some deduction I realised that it was to do (I think) with the fequency. I sold my old TV and brought a new one that was a 100Hz. My theory was somewhat confirmed when they delivered it and it was the 50Hz version and yes, the high pitch sound was very evident! Upon receipt of the 100Hz model and I immediately noticed the difference.
I'm guessing then that the MacBook has something inside emitting 50-60Hz - someone on this forum mentioned that too.
Although I want the portability, I can't stand that sound all day long, so I'm thinking of taking it back and swapping it for an iMac.
The question is, will I find the same problem? I'm not sure of the technical specifications in terms of Hz's between the two machines.
It's too noisy in the shop to tell.
Any advice appreciated.
PS - did not have this issue with my 2008 MacBook pro.
PPS - makes no difference if it's plugged in or not.

Isolating the source of the high frequency would take a technician with the instruments to deteermine what components emit sound...actually very easy to do with the proper test instruments, but essential to tell you what is causing the offending sound.  Unless you know that it will be very hard to determine if the iMac will not do the same thing.
Only qualitative way to find out is go to an Apple store or reseller with a good selection of hardware, work with the different hardware and see if it bothers you.  Preferably with few people around and low background noise level so the sound isn't masked.

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