2. Questions Bank
  3. 9th Class
  4. Science
  5. Sound

9th Class Science Sound Question Bank 9th CBSE Science Sound

  • question_answer
      At 20°C, what should be minimum distance of a person from a sound reflecting surface to hear an echo?

    Answer:

       Minimum distance from sound reflecting surface to hear an echo should be at least 17.2 m.


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