Sound ge問題

1. No, transmission of sound requires a medium, within which constituent particles collide one by one in an array.
In other words, sound (or sound wave) must be produced through a certain medium.
Otherwise, in vacuum, sound cannot be produced. Hence, we cannot hear the bell ring.
2. The speed in solid is faster.
The speed of sound depends on the density of a medium.
In solid, being higher density than liquid, its molecules undergo collision at a higher frequency.
Thus, sound wave is transmitted more efficiently (higher speed) in solid.

1.唔得,因為聲波係靠粒子振粒黎傳播既,係真空裏面跟本冇粒子,所以唔會聽到.
2.由於聲波係靠粒子振粒黎傳播,所以粒子既密度愈高,聲波既傳播速度就愈高,由於固體既密度比液體高,所以係固體到聲音會傳送得比較快.