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.
Personal checks older than six months are sometimes called âstale-datedâ checks. Banks/credit unions have no obligation to deposit or cash a check older than six months, but whether or not to cash a stale-dated check is ultimately at the individual bankâs/credit unionâs discretion, depending on the funds available and the financial institutionâs relationship with the customer.