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.
Rating Newest Oldest. Best Answer: It used to be that personal checks over 6 months old became stale-dated and would have to be reissued. That's really not the case anymore. According to Bankers Online, if someone wants to cash or deposit a check that is more than 6 months old, the paying bank can pay it or not.