SAT2物理的一道题,关于声(波),英语的……30.A piano tuner tunes a piano by ringing a tuning fork and playing a key on the piano simultaneously.The tuning fork rings with a frequency of 100 Hz and the piano string vibrates with a frequ

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SAT2物理的一道题,关于声(波),英语的……30.A piano tuner tunes a piano by ringing a tuning fork and playing a key on the piano simultaneously.The tuning fork rings with a frequency of 100 Hz and the piano string vibrates with a frequ

SAT2物理的一道题,关于声(波),英语的……30.A piano tuner tunes a piano by ringing a tuning fork and playing a key on the piano simultaneously.The tuning fork rings with a frequency of 100 Hz and the piano string vibrates with a frequ
SAT2物理的一道题,关于声(波),英语的……
30.A piano tuner tunes a piano by ringing a tuning fork and playing a key on the piano simultaneously.The tuning fork rings with a frequency of 100 Hz and the piano string vibrates with a frequency of 150 Hz.What is the frequency of the beats the piano tuner hears between the two dissonant sounds?
(A) –50 Hz
(B) 0.67 Hz
(C) 1.5 Hz
(D) 50 Hz
(E) 250 Hz
他说的150-100=50Hz,为什么不是-50?
我的问题就是为什么要用150-100……我对波一窍不通

SAT2物理的一道题,关于声(波),英语的……30.A piano tuner tunes a piano by ringing a tuning fork and playing a key on the piano simultaneously.The tuning fork rings with a frequency of 100 Hz and the piano string vibrates with a frequ
可以把这两个频率看成是两个力,大的力会影响小的力 ,而这里如果两个力分别为150N和100N,那么它们的合力就是50N,以此来理解,那么频率差就是50Hz.而且频率是没有负值的 就像力也不可能是负的一样

因为frequency是标量啦.....虽然不知道你知不知道矢量和标量.....反正物理里的负号表示的都是方向不是正负.....像速度之类的就有负的表示是和规定的单位向量反方向,而像重量频率这些都是标量只能是正的。

负值的话还能听见么?