問題詳情
31. A flute player holding a tone with a frequency of 520 Hz approaches a wall at 2 m/s on a day whenthe speed of sound in air is 340 m/s. The frequency in Hz he hears coming back to him from the wallis
(A) 260
(B) 517
(C) 520
(D) 523
(E) 526.
參考答案
答案：E
難度：計算中-1
書單：沒有書單，新增