Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_261642_3 (r__ω_km_ VARCHAR, frequency__hz_ VARCHAR)

### Question ###
What is the r (ω/km) when the frequency is 10k?

### Accurate SQL ###

SELECT r__ω_km_ FROM table_261642_3 WHERE frequency__hz_ = "10k"