.Suppose you have following material available in your school laboratory : (A) An intense pointed source of sound (B) An intense and broad source of sound (C) A sharp pointed sound detector (D) A well polished metallic sheet (E) Two thin hollow card board tubes You can perform the experiment on verifying the laws of reflection of sound successfully without using :
Answers
Explanation:
Fix the white sheet on drawing board with thumb pin.
Draw a line AB to place the metal plate as reflecting surface with the help of metal stand, and draw normal OP to this line as shown in the figure.
Now draw a line OC making an angle of 30° with the line OP.
Place one metal tube near to the point O of normal and metal plate on the line OC.
Place the ticking watch closer to one end of this metal tube.
Now place the second tube so that its one end is near to the point O. Bring your ear close to the other end and adjust its position such that it collects the maximum reflected sound.
Mark the position of the tube when it collects the clear and maximum reflected sound.
Draw an extended line of reflected sound wave and mark it as OD.
Measure the angle of incidence and the angle of reflection.
Follow the above procedure and record your observation thrice.
Observation Table
Result
The angle of incidence is equal to the angle of reflection.
The incident, normal and reflected sound waves lie in the same plane.
Precautions
The metal plate should be placed vertical on the drawing board.
Both the pipes used should be clean and shining.
The sound producer i.e. stopwatch should be placed closer to the end of the metallic tube.
Avoid touching of the source of sound to the metal tube.
Maintain complete silence in the lab.
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