This is the 6392nd most frequent Russian word.
частотой
"Частотой" means "frequency" in English.
In this sentence, 'частотой' is used in an instrumental grammatical case to describe the property of radio waves, indicating their characteristic frequency.
Эти радиоволны отличаются высокой частотой.
These radio waves differ by high frequency.
Here, 'частотой' specifies the measurement context, referring to the rate at which beats occur.
Твоё сердцебиение изменилось на частотой ударов.
Your heartbeat changed to the frequency of beats.
Here 'частотой' refers to the operational range or spectrum within which the device functions.