1.

Testing of sound.

Answer»
  • Take a plastic or iron funnel. 
  • Stretch a piece of rubber balloon and cover the wide part of the funnel with it. 
  • Tie it with rubber band. 
  • Ask your friend to shout ‘Oh’ at the narrow opening of the funnel. 
  • Observe the movements of the rubber sheet while he is shouting. 
  • Observe the rice grains also.
Observations:
1. Due to the vibrations in the rubber balloon the rice grains move up and down when we shout ‘Oh’ at the narrow opening of the funnel. 
2. When we put the narrow end at the opening of our eye we hear the sound of heart as lub dub, lub dub …………….


Discussion

No Comment Found

Related InterviewSolutions