Describe an activity to listen the reflection sound.

Explanation

1) Take two long indentical tubes and place them on a table near a wall.
2) Ask your friend to speak softly into one tube while your use the other tube to listen.
3) Adjust he tube until you hear the best sound.
4) You will find that you hear your friend's voice best when the tube makes equal angles with a normal to the wall.
5) This shows that reflection of sound follows the laws of reflection of light.
6) Lift your tube slightly above the table.
7) You will not be able to listen the voice clearly, because the plane carrying the incident wave and reflected wave are changed.
8) Repeat the experiment by placing flat objects of different materials against the wall and observe the changes in the sound.
Observations :
1) Reflection of sound follows the laws of reflection of light.
2) When the plane carrying incident wave and reflecting wave changes, the reflected sound cannot be heard clearly.
3) Hard or rough surface reflect the sound better than soft surface.
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