Sound normally travels through air, however it can also travel through liquids and solids
But it does not travel through vacuum
Hence different medium where sound can travel are
- Solids
- Liquids
- Gas
Sound can travel through Solids
Example 1
If we scratch one end of table, it can be heard from other end of table
Example 2
If we put our ear on railway tracks, we can hear approaching train even if it is very far away
Sound can travel through Liquids
Example
We take jar full of water
We put a bell in it
We place our ear near water and ring the bell
We are able to hear the bell
This shows sound can travel through water
Sound can travel through Gases
Example
If 2 people talk, sound travels through air, so we are able to hear
Sound cannot travel through vacuum
If we put our phone in tumbler and ring it, ring can be heard clearly
But if we suck air out of tumbler and then ring it, sound becomes fainter(less)
If we suck all the air, we will not be able to hear anything
This shows sound cannot travel through vacuum
Questions
NCERT Question 1 - Choose the correct answer :
Sound can travel through
(a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases
NCERT Question 3 A - Mark True or False
(a) Sound cannot travel in vacuum. (T/F)
