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

9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    The given figure shows four similar sound waves entering four different media of equal thickness, t.
    The sound wave will emerge first from medium

    A)  I                                             

    B)  II       

    C)  III                          

    D)  IV

    Correct Answer: C

    Solution :

      Here, the student needs to examine the speed of sound in different media. The speed of sound through a medium is directly proportional to its density. Density of glass is greater than that of the other three media (air, water, and vacuum). Therefore, the speed of sound in glass is greater than that in air, water, and vacuum. It takes lesser time for sound to cover the same distance through glass than through air, water, and vacuum. Hence, the sound wave will emerge first from medium III. The correct answer is C.  


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