what vs which

[Nithin]

i'm not sure about usage. are both of these correct/wrong?

"I don't know what channel it's on"
"I don't know which channel it's on"

Thanks,
N.

 

[iwantanewcomputer]

either

but which implies a choice between some probably known channels.
what can mean you just don't know the channel

 

[aplefka]

Which is probably more accurate in that case. Either way both function fine as secondary adjectival clauses, so grammatically it's correct, just not sure on usage. I'd go with which.

 

[Nithin]

Originally posted by: iwantanewcomputer
either

but which implies a choice between some probably known channels.
what can mean you just don't know the channel

this makes sense.