2. Free Ncert Solutions
  3. 9th Class
  4. Science
  5. Sound

9th Class Science Sound

  • question_answer 52)
      Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

    Answer:

      The frequency of vibrations of pendulum is below 20 Hz (infrasound). We cannot hear infrasound but humming produce audible sound which can be heard by human beings.


You need to login to perform this action.
You will be redirected in 3 sec spinner