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.
A stale check is an old check usually older than a specified period of time such as 6 months.Some banks will not honor stale checks. A cheque is said be stale when it has not been presented by the payee within the stipulated time set aside by the financial institution regulatary body.The period are usually 6- 12months of issue. stale check is an old check usually older than a specified period of time such as 6 months.