The period of a 10 kHz radio wave traveling at 10^{8} {ms}^{-1} is--

Correct Answer is : 1.0×10−4 s1.0 × 10^{-4}\,{s}1.0×10−4s

Correct Answer is : 1.0×10−4 s1.0 × 10^{-4}\,{s}1.0×10−4s

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WAEC Physics 2022 Paper

Question : 19

Total: 50

10^{8} \text{ms}^{-1}

Solution:

Concept:

The time period of a wave is the reciprocal of its frequency.

The given speed is not needed for this calculation.

Explanation:

Frequency,

f = 10\,\text{kHz} = 10{,}000\,\text{Hz}

Using the relation:

\text{Period} = \frac{1}{f}

So,

T = \frac{1}{10{,}000} = 0.0001\,\text{s}

Expressing in scientific notation:

T = 1.0 \times 10^{-4}\,\text{s}

Answer:

1.0 \times 10^{-4}\,\text{s}

So the correct option is B.

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