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.
Check Expiration Date. A cashier's check does not have an expiration date. However, some banks have a specific time frame during which check funds are guaranteed. If the bank has a specific time frame, it is often printed on the check.For example, the check may read Void After 90 Days..If you are unsure of a bank's protocol for cashier's check expiration, contact the issuing bank to determine. The issuing bank's name appears on the face of the check.f the bank has a specific time frame, it is often printed on the check. For example, the check may read Void After 90 Days.. If you are unsure of a bank's protocol for cashier's check expiration, contact the issuing bank to determine. The issuing bank's name appears on the face of the check.