本题目来源于试卷: Physics Unit12: Sound，类别为 国际高中通用物理
[单选题]
The wavelengths of the soun46 mtnuitk 8*59fr2m:cz jwgukz16ceds proumd/1lk/z9 5hriu tir 5:j7yk duced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velok kthzrj 5dlur :y1i95u //mi7city of sound is 340 m/s?
A. $5 \; Hz$
B. $6 \; Hz$
C. $7 \; Hz$
D. $8 \; Hz$
参考答案: D
本题详细解析:
暂无
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