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試卷名稱：114年 - 114 國立中山大學_學士後醫學系招生考試試題：物理與化學#126239
年份：114年
科目：學士後西醫物理及化學
10. When the observer and the sound source are stationary relative to each other, the observed frequency is f. Suppose the observer and the source are moving toward each other. If the observer's speed is 0.25v and the source's speed is also 0.25v, where v is the sound speed. What will be the observed frequency?
(A) 5f/4
(B) 3f/4
(C) 4f/3
(D) 3f/5
(E) 5f/3
