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.
Nature of stale check. Stale check is a check that is presented to be cashed or deposited at a bank six months or more after the date it was written.he bank receiving a stale check can return the check to the paying bank marked unpaid, request a new check be issued or consult with the person who wrote the check. For example, XYZ Company submitted a series of checks to Raw Material Services, Inc. to pay for supplies necessary for manufacturing and production.