North Carolina RADAR State Practice Exam

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Prepare for the North Carolina RADAR State Exam with essential insights and practice questions to boost your confidence. This comprehensive resource will guide you through the exam requirements, helping you maximize your chances of success.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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While the speed of light remains constant, which two characteristics of radio waves are variable?

Wave length and frequency
Amplitude and wavelength
Frequency and intensity
Wave length and speed

The correct answer is: Wave length and frequency

The correct answer highlights that wavelength and frequency are characteristics of radio waves that can vary. In the context of electromagnetic waves, including radio waves, the speed of light is constant at approximately 299,792 kilometers per second in a vacuum. This means that as one characteristic changes, the other must adjust to maintain that constant speed. According to the relationship between speed, frequency, and wavelength, the speed of a wave is equal to its frequency multiplied by its wavelength. Therefore, if the frequency increases, the wavelength must decrease to keep the product of frequency and wavelength constant (and vice versa). This relationship illustrates how wavelength and frequency are interdependent and variable in the context of radio waves. The other options involve pairs of characteristics that either do not fully address the variable nature of radio waves or include speed, which is a constant in this context.