The period of a sine wave is 0.02 seconds, its frequency is

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50 Hz

Explanation: Given: The time period of the sine wave T = 0.02 seconds.

Formula Used: $$f = \frac{1}{T}$$

Steps: Identify the given values: The time period $T$ of the wave is given as $T = 0.02 	ext{ seconds}$.. Select the relationship formula: The frequency $f$ is defined as the reciprocal of the time period $T$.. Calculate the frequency: Substitute the given value $T = 0.02$ into the formula: $f = \frac{1}{0.02}$.

Answer: D is correct because substituting the period $T = 0.02$ seconds into the frequency formula $f = \frac{1}{T}$ yields a frequency of 50 Hz.

Exam Tip: In power systems, this is known as the supply frequency; most countries use either 50 Hz or 60 Hz as the standard grid frequency.

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