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Determine the speed of the wave.   

Physics
WAEC 2021

Determine the speed of the wave.   

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  • A.  64 cm/s 
  • B.  32 cm/s    
  • C. 24 cm/s   
  • D. 72 cm/s
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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Correct Answer: Option D
Explanation

Speed = Wavelength x Frequency

or

 V = fλ, where frequency = 1/period, f = 1/T.

The period was given as 0.125sec and wavelength = 9cm

: f = 1/T = 1/0125 = 8.

 V = fλ = 8 × 9 = 72m/s

 


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free