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.
9,881 posts, read 35,526,023 times. Reputation: 11563. Generally speaking, a check is stale after 6 months absent any other stated time limit on it (sometimes, you'll get a check that is stated to be good for only a few months). You'll not be able to get this old of a check honored at your bank.