There can never be sound unless there is?

Question

There can never be sound unless there is?

a. heat

b. moisture

c. light

d. vibration

I would like to know which answer is correct?

Answer 1

Let’s first eliminate the ones that cannot be true.

B - Moisture. Moisture is water based, unless you have a different definition of it. Sound carries through dry rock and dry air as long as there are particles to continue the sound wave.

C - Light. Turn off the light at night and see if you can hear noise, this one is easy to disprove.

A and D are not so easy.

Vibration is the actual basis of sound, so it cannot be dismissed. The problem occurs when you think about heat too much. At absolute 0, there is no motion (hydrogen becomes a solid.) IF nothing can move, then there is no vibration, and no sound.

I would have to argue for heat being the needed item, your teacher may disagree.

Answer 2

d. vibration cuz there is no sound with out it .vibration vibrate molecule of air which vibrate our ear's  drum  that make us hear the sound

Answer 3

vibration, all sound is waves vibrating to a frequency

Answer 4

vibration

Answer 5

d

Answer 6

d. vibration.

Answer 7

c) light =)

Answer 8

Well... my first instinct would be to say vibration, but when you look harder at the question and the answers given, it takes all of the above to cause sound. Light causes heat which can cause moisture to expand rocks, which can ultimatley break. thus causing your sound. Heat also causes vibration in atoms which can after a while cause sound.