本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理
[单选题]
The wavelengths of they .d1tuw:6,c5qyqri9zw t7yq sounds prwfmni))1 t w6 pyr+o0o rvq(uk5/z;feoduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded oz(n1k /6v+5r)wfetofiurw; yqmp0) on a day when the velocity 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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