A radio is tuned to 30 m band. What is the frequency of transmission of the broadcasting station? (Answer the question)

Your radio is tuned to 25 m band. Calculate the frequency of transmission of the broadcasting station.

What is the frequency range of sky waves? (Answer the question)

Fill in the blank : The frequency of radio waves broadcast from certain station is 2000 kHz. The wave length of this transmission is ________.

A closed and open organ pipe are tuned to the same frequency. What is the ratio of their lengths?