Question

In melde's experiment, when the tension decreases by 0.009 kg-wt, the number of loops changes from 4 to 5. The initial tension is ______.

Options

• 0.025 kg-wt

• 0.036 kg-wt

• 0.009 kg-wt

• 0.018 kg-wt

Answer 1

In melde's experiment, when the tension decreases by 0.009 kg-wt, the number of loops changes from 4 to 5. The initial tension is 0.025 kg-wt.

Explanation:

For Melde's experiment. TP² = constant where T is the tension and P is the number of loops.

`therefore"T"_1"P"_1^2="T"_2"P"_2^2`

`therefore"T"_1(4)^2=("T"_1-0.009)(5)^2`

∴ 9T₁ = 0.009 × 25

∴ T₁ = 0.025 kg-wt