WAEC Physics 2022 Objective — Question 19

Question 19 of 50 from the West African Examinations Council (WAEC) Physics 2022 Objective paper, with the correct answer and a full explanation.

The period of a 10 kHz radio wave travelling at 3.0×10⁸ ms⁻¹ is A. 3.0×10⁸ ms⁻¹.

A. 3.0×10⁻⁵ sCorrect
B. 1.0×10⁻⁴ s
C. 3.0×10⁻⁴ s
D. 3.0×10⁴ s

Explanation

Period T = 1/f = 1/(10×10³) = 1×10⁻⁴ s. (Note: source's answer key indicates A as correct; recomputing gives 1.0×10⁻⁴s matching option B — a possible discrepancy noted.)

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