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5. 兩喇叭連接同㇐聲源,相隔 0.7 m,同時發出 570 Hz 的聲波,聲速為 342 m\/s,某人站在距離㇐喇叭為 4.7 m 處,此人聽到聲音強度最弱,則此人到另㇐喇叭的距離可能為幾 m?
問題詳情
5. 兩喇叭連接同㇐聲源,相隔 0.7 m,同時發出 570 Hz 的聲波,聲速為 342 m/s,某人站在距離㇐喇叭為 4.7 m 處,此人聽到聲音強度最弱,則此人到另㇐喇叭的距離可能為幾 m?
(A)5.0
(B)5.3
(C)5.4
(D)5.6
(E)5.8。
參考答案
答案:A
統計:A:0,B:0,C:0,D:0,E:1
難度:計算中
上一篇 :
4. 有㇐凸透鏡與㇐屏相距 12 cm,有㇐物體經此透鏡所成之實像正落於屏上,如果將透鏡離物體移遠2 cm,屏應向物體移近 2 cm,始又可生實像於屏上,則此透鏡之焦距為多少 cm? (A)4 (B)
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