JAMB Physics 2019 Objective — Question 12
Question 12 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.
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A plane progressive wave is represented by y=2sin(100πt−0.2πx) where all the symbols have their usual meanings. What is the velocity of the wave?
- A. 100m/s
- B. 200m/s
- C. 500m/sCorrect
- D. 400m/s
Explanation
From 2πft=100πt: f=50Hz. From 2πx/λ=0.2πx: λ=10m. Velocity V=fλ=50×10=500m/s.
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