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1.2

Minor Versionm

by Procheta Mallik

Introduction

Cut a PET bottle in half and and connect them using a long string. You can use this to communicate over some distance with the thread being the medium for propagation of sound.

    • be careful while handling scissors and paper cutter or any sharp tool

    • Trim off any plastic scrap on the edges of cut parts of the bottle

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  1. Cut the plastic bottle and make sure to trim the scrap off the edges of cut parts.
    • Cut the plastic bottle and make sure to trim the scrap off the edges of cut parts.

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    • Take the cap out and make hole just large enough to insert the thread through

    • Tie knot 3-4 times on the other side so that the thread does not come out through the hole when in tension.

    • Repeat the above 2 steps with the other end of the string and other cut part of the bottle.

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    • Do same as mentioned in the previous step

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    • The speaker uses the lower portion of the cut bottle and the listener uses the portion of the bottle with the cap.

    • The string must be kept taut while using the toy.

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    • Measure the length of the wire when fully taut.

    • Next, hold the string such that it is slack and try talking through the phones.

    • What difference did you observe? Did sound become softer or louder? If so, why?

    • Then repeat the experiment with strings of different lengths. Try the maximum length possible. Is sound growing louder of fainter?

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    • Use some other material instead of thread. Try with rubber pipes as well as plastic pipes with small diameters.

    • From the speaker side use different sources of sound and listen on the other side.

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Finish Line

Vishal Bhatt

Member since: 04/26/2017

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