Is physics that hard as I hear that it's a very head cracker
Answers
Answer:
Explanation:
I ISound is vibration of atoms or molecules of gas, liquid or solids in such a way so that the frequency of vibrations is between 20 Hz to 20KHz and its amplitude is such that it causes change in atmospheric pressure by 20 micro Pascal ,the minimum level of sound that humans can hear.
Now these types of vibrations can be produced in various ways like rubbbing, breaking, expansion, hitting, blowing with pressure, setting vibrations in a string etc.
In a cracker, sudden ingnition of chemical causes air to expand so loudly and so fast that it sets high amplitude vibrations in the adjacent air giving us a feeling of explosion. Actually, when air expands due to intense heat, it also collapses or a vaccum is created at the same space as soon as heat is over, setting huge changes in ambient pressure. Very high amplitude sound for a short period is called explosion and such sounds can travel to large distances. In air, molecules vibrate in the direction of the movement of sound energy.
The same cracker can be exploded inside ocean or inside Earth, result is the same, except in water, molecules vibrate at 90 degree from the direction of movement of sound energy.
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