SYJC Physics Practical - Melde's Experiment ( Demonstration Expt)

MELDE'S EXPERIMENT

Aim: To demonstrate the formation of stationary waves and verify that the number of loops in perpendicular position is twice the number of loops in the parallel position, if length of string and mass are kept constant.

Apparatus: A tuning fork, a thin light string, a pulley, weight box, rubber hammer, meter scale and retort stand.

Diagram:

Parallel Position

Perpendicular Position

Observations:

g = 980 CGS units

Parallel Position:

1. Mass of the pan (m₁)  = 1 gm

2. Mass in the pan (m₂) = ______ gm

3. Total mass m = m₁ + m₂ = _________ gm

4. Length of the string (L) = __________ cm

5. No of loops (p) = _______

6. Length of each loop ( l = L/p) = ________ cm

7. Tension in the string T = mg = ________ dynes

8. p²T = ______

Perpendicular Position:

1. Mass of the pan (m₁)  = 1 gm

2. Mass in the pan (m₂) = ______ gm

3. Total mass m = m₁ + m₂ = _________ gm

4. Length of the string (L) = __________ cm

5. No of loops (p) = _______

6. Length of each loop ( l = L/p) = ________ cm

7. Tension in the string T = mg = ________ dynes

8. p²T = ______

Result:
We conclude from above that the number of loops in perpendicular position is twice the number of loops in parallel position.