For years, marine scientists were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-called T-waves were among the purest sounds in nature. Eventually they traced the source to underwater volcanoes, whose rising columns of bubbles resonated like organ pipes. What is the wavelength of a typical T-wave whose frequency is 7 Hz? (The speed of sound in seawater is 1530 m/s.)

Answer: Here , we know that , v= n ……..(1) Where V = speed of sound n = Frequency of the wave = wavelength Given = v= 1530 m/ s. n= 7 Hz Calculating the wavelength , Rearranging equation (1) = v/n = 1530 m/ s./ 7 Hz = 218.6 m Wavelength of the wave is 218.6 m