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Wonders of Physics


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Time interval between two sounds from a gun – direct and reflected sound

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Solutions: Option B

You can view the video tutorial here or the written solutions below.

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Demonstration of Reflection, Refraction and TIR using light source with a slit

Reflection of light using a mirror

Refraction of light using various shaped optical mediums

Total Internal Reflection (TIR) using a semi-circular perspex

For Total Internal Reflection (TIR) to occur:
1) angle of incidence i is greater than the critical angle c
2) the light is travelling from a denser medium towards a less dense medium

Click on this post for the explanation of TIR


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N2005P1Q24 Sound – Reflection of sound from 2 walls

A man who is standing at a point X between two parallel walls (as shown in the diagram) fires a starting pistol.

sound

He hears the first echo after 0.6s and another one after 0.8s. How long after firing the pistol will he hear the next echo?

Solutions:

View video tutorial to visualise the distance travelled.

Time taken to hear next echo = 0.6 + 0.8 = 1.4s

The distance travelled by sound (left and right) from X is the same during 3rd and 4th echos.

Hence 3rd and 4th echos actually coincide. And time taken is 0.6 + 0.8 = 1.4s.