阿摩線上測驗
53. Two strings of different linear mass density are joined at x = 0 to form a new string. The heavier string and the lighter string are on the left and right hand side of x = 0, respectively. Now, we keep the string stretched with a fixed weight, and send a wave from the heavier end to the lighter end. Which of the following statements is correct?
(A) As the wave travels to the lighter end, its profile is amplified.
(B) As the wave travels to the lighter end, its speed decreases.
(C) As the wave hits x = 0, the reflected wave travels faster in the heavier string.
(D) The speed of the traveling wave remains the same regardless of which ends.
(E) As the wave hits x = 0, there is no reflected wave.
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統計： A(6), B(1), C(0), D(2), E(0) #2993352
統計： A(6), B(1), C(0), D(2), E(0) #2993352
詳解 (共 1 筆)
陽光青提
#7153999
可以由公式得知
- 波速速率公式：V=(F/μ)^1/2
- 波傳播功率公式：P=1/2*μ*V*ω^2*A^2
當重繩(μ1)傳入輕繩（μ2）時 質量密度變小 (μ2<μ1)
公式1 得知 μ變小 因此V變大
公式2 得知 功率P不變，μ變小，A 變大
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