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.
Do cashier's checks have expiration dates? For example most checks are good for 90 or 120 days. If I have a cashier's check and don't see an expiration date on it, does it mean I can cash it even 5 years in the future? Update: This isn't a regular check, it's a cashier's check. Update 2: this is a CASHIER'S CHECK.