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_20 (part_number_s_ VARCHAR, frequency VARCHAR)
### Question:
What part number(s) has a frequency of 2.4 ghz?
### Answer:
SELECT part_number_s_ FROM table_name_20 WHERE frequency = "2.4 ghz"