Can arduino cause some radiation in 5v and with motor?

I was testin motors and I put motor speed to top in motor example code and i put 5v to 0v on/off switching like max speed (maybe mhz??) . Motor made weird high noise. Then i wondered that can arduino cause ultrasound noise or any other kin of fysic radiation with motor? Who knows about it? its weir and i m interested

Motors generate all kinds of of noise: audible, inaudible, electrical and radio frequency noise.

Do not try to power a motor or servo from an Arduino. The Arduino will malfunction and might even be destroyed. Always use a separate motor power supply and connect the grounds.

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Okay. Do you know if those noises and radiations can be dangerous? (for example to hearing)

Yes, motors can certainly be dangerous. But it is unlikely that a small toy motor will damage anything other than the Arduino, if you use a separate power supply.

milli hertz? 'm' is milli, 'M' is mega, you need to get such things right in electronics!!