PHY 物理 wave

The vibrating string also sets the neighbouring air into vibration. Which of the following statements about the waves on the string and those in air must be correct?

A. They are both transverse

B. They are both stationary

C. They have the same speed

D. They have the same wavelength

E. They have the same frequency


個答案是E...

我想問點解E係岩..而A-D係錯

謝謝!!!