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.
Checks are stale after 6 months. The bank may or may not accept the check if it is over 6 months if it is a government check. These are almost always good (money is available to pay the check).Other checks are questionable as to the funds availability. If the chech has a expiration date, you'll have to get the issuer to reissued the check to you.tate of Michigan, check is dated 5-4-2009. Has it expired already?? How long do you have to cash/deposit a State Income Tax Check before it expires?? Thanks!!!