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.
Report Abuse. A check is considered stale-dated after 6 months from the date on the check. A teller should catch that before they try to cash it because stale-dated checked almost always get returned because of the date.Many business checks say on the front of the check if they are void after 60 or 90 days and many rebate checks don't even have a date they just say void if cashed after XXX, 200X.Kristin Â· 8 years ago. Thumbs up.1.any business checks say on the front of the check if they are void after 60 or 90 days and many rebate checks don't even have a date they just say void if cashed after XXX, 200X. Kristin Â· 8 years ago. Thumbs up. 1.