[dread78645]

Yes, I’d assume (without any additional information) that the frequency is important.

The reason why microwave ovens heat your food is that they’re operating in the “water hole” in the electromagnetic spectrum — they’re literally causing the H2O molecule to flex the two O’s off the side of the H atom.

Minor nit:
The “water hole” in the electromagnetic spectrum is at ~1cm or 300GHz. Most modern microwaves operate at 12.24cm or 2.45GHz.
This "de-tuning" ensures that the radiation is not totally adsorbed by the first layer of water it encounters. Otherwise your microwave hamburger would be ashes on the outside and still frozen on the inside.

[djf]

Quiz of the day:

What was the very first food ever cooked by microwave?

[NVDave]

You’re right — mea culpa for the terminology error.