An organ pipe produces a musical note same number of nitrogen gas molecules. with a wavelength of 2.72 m. What is the frequency of this note if the speed of sound is 348 m/s?
A: 128 Hz

Which of the following tools is most useful for tightening a small mechanical fastener?
A: pliers

Which of these locations in the solar system contains the most asteroids?
A: between Mars and Jupiter

Which structure is found in producers in nearly all ecosystems?
A:
chloroplasts