Frequency is measured in hertz (Hz). A person who has hearing within the normal range can hear sounds that have frequencies between 20 and 20,000 Hz. The most important sounds we hear every day are in the 250 to 6,000 Hz range.
An issue date was added, and cheques may not be valid a certain amount of time after issue. In the US and Canada a cheque is typically valid for six months after the date of issue, after which it is a stale-dated cheque, but this depends on where the cheque is drawn; in Australia this is typically fifteen months.
But if you can, go ahead and get those checks cashed now before they're more than 1-2 months old -- save yourself any confusion or delay at the bank, because even if it gets cashed, it's possible that you'd have a delay while the bank teller asks management whether they should honor your four-month-old check.ow, those are a couple of big only ifs, and because of that, most banks will (1) honor any Void after XX days printed on the check-they simply won't cash it past that date, and (2) in most circumstances, a bank will not cash a check that is more than six months old - 180 days past the issue date and it's a no go.