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

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

Short/Brief 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

Describe a simple experiment which demonstrates that the sound produced by a tuning fork is due to vibrations of its arms.

What is a longitudinal wave? In which medium: solid, liquid or gas, can it be produced?

Explain the terms crest and trough in relation to a transverse wave.

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

Pressure of air

The time period of a simple pendulum is 2 s. Find its frequency.

Can sound travel through vacuum?

Is the speed of sound different in different media?

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.

State three important uses of echolocation.