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Metal cables are used as telephone wires because?

Physics
JAMB 2009

Metal cables are used as telephone wires because?

  • A. they are cheap
  • B. they are sourced locally
  • C. the speed of sound in them is very low
  • D. the speed of sound in them is very high
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Correct Answer: Option D
Explanation

The speed of sound is highest in solid.

Metals (solids) like copper, steel rod, etc

There is an explanation video available below.

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Explanation Video

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now