If You Place Your Ear Close to an Iron Railing Which is Tapped Some Distance Away, You Hear the Sound Twice. Explain Why? - Physics

If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why?

Short Note

Sound travels in iron faster than in air so first the sound travelled in iron rail is heard and then the sound travelled in air is heard.

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Chapter 8: Propagation of Sound Waves - Exercise 8 (A) [Page 182]

Chapter 8 Propagation of Sound Waves
Exercise 8 (A) | Q 29 | Page 182

Choose the correct word/words to complete the following sentence :

When sound travels in a medium ____________

Describe an experiment to show that in wave motion, only energy is transferred, but particles of medium do not move.

How does the following factor affect, if at all, the speed of sound in air:

Temperature of air

How does the following factor affect, if at all, the speed of sound in air:

Moisture in air

Can sound travel through vacuum?

Does sound require a material medium for transmission?

Does the speed of sound depend upon the direction of wind?

How will the following factors affect the speed of sound in air:
Temperature of air.

How will the following factors affect the speed of sound in air:
Wind.

State three important uses of echolocation.