Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_97 (frequency VARCHAR, launched VARCHAR)
### Question:
What is the frequency of the station that was launched on 21 August 1994?
### Answer:
SELECT frequency FROM table_name_97 WHERE launched = "21 august 1994"