A.λ/4 B.λ/4n C.λ/2 D.λ/2n
A.x+y+z+2=0 B.x+y-z+2=0 C.x-y+z+2=0 D.x+y+z-2=0
A.振動(dòng)頻率越高,波長(zhǎng)越長(zhǎng) B.振動(dòng)頻率越低,波長(zhǎng)越長(zhǎng) C.振動(dòng)頻率越高,波速越大 D.振動(dòng)頻率越低,波速越大