what frequency vs which frequency

Both 'what frequency' and 'which frequency' are correct, but they are used in different contexts. 'What frequency' is used when asking for an unknown frequency among a range of possibilities, while 'which frequency' is used when selecting a specific frequency from a known set of options.

Last updated: March 24, 2024

what frequency

This phrase is correct and commonly used in English when asking for an unknown frequency among a range of possibilities.

Use 'what frequency' when you are asking for the specific frequency of something that is not predetermined or known.

Examples:

What frequency does the radio station broadcast on?
What frequency should I set the microwave to?
What frequency does the earthquake monitoring system operate on?
What frequency is the signal transmitted at?
What frequency is the best for this type of communication?

Show examples from the web [+]

Come on, Assi, what frequency?
If so, has it consented to regular inspections, and with what frequency?
When we were tracking him, he knew what frequency we were on.
In addition to specifying which routes are to be served and with what frequency, the five-year plans also specify the investments the concessionary companies intend to make over the period in order to guarantee service on the routes in question.
The Commission would also decide in future if and on what frequencies radio communications can be broadcast.
On what frequencies and bandwidths are the messages broadcasted?
What is the frequency and size of the tenders?
what was the frequency of non-compliances in various sectors?
What? The new frequency of the deflector grid is set to turn the station into a massive chroniton array aimed directly at the wormhole.
What is the minimum frequency with which the borrower are obliged to make payments if they have a balance outstanding.
What if the frequency sets it off?
Do you know what a radio frequency tag is?
What's the frequency for the boat?
So what's the frequency Kenneth?
Can the Commission confirm whether the relevant working group is now established and functioning, and what the frequency of its meetings is?
George and Gracie's transmitter, what's the radio frequency?
If yes, what arrangements apply (frequency, checks on project activities/financial aspects, etc.)?
In general terms, what monitoring frequencies have been set in permits for air emissions, water emissions, soil/groundwater emissions and other relevant process parameters?
What is the frequency of investor redemptions (if multiple classes of shares or units, report for the largest share class by NAV)
What if the frequency sets it off? No, no, no.

Alternatives:

At what frequency
On what frequency
At which frequency
On which frequency

which frequency

This phrase is correct and commonly used in English when selecting a specific frequency from a known set of options.

Use 'which frequency' when you are choosing a frequency from a set of known options or possibilities.