A transverse wave travels from a string of linear density μ to another string of density 4μ under the same tension. If the reflected average-power fraction is N/9, find N.

Question

G1 Physics · Accepted Answer

For the two strings, Z₂ = 2Z₁. Hence, r = Aᵣ/Aᵢ = −1/3. The reflected power fraction is R = r² = 1/9. Thus, N = 1.