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What is the frequency of the sound made by a siren having a disc with...

Physics
JAMB 1992
What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?
  • A. 80Hz
  • B. 600Hz
  • C. 800Hz
  • D. 1600Hz
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Correct Answer: Option C
Explanation
No of holes x Revolution

F = NH x NR

= 32 x 25

= 800Hz
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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Post UTME Past Questions Agent
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