__________ is the time between the passage of two wave crests at a fixed point

__________ is the time between the passage of two wave crests at a fixed point

• A. Wave period
• B. Frequency
• C. Amplitude
• D. Wavelength

Answer: (A)

The time between the passage of two wave crests at a fixed point is the period of the wave. It is the duration of one complete cycle, measured in seconds. If a crest passes every 0.25 seconds, the period is 0.25 s, and the frequency is 4 cycles per second (4 Hz) since frequency is the reciprocal of the period (f = 1/T). Wavelength is the spatial distance between adjacent crests, not a time measure, while amplitude describes how tall the crest is. The wave’s speed relates these quantities through v = fλ = λ/T.

The time between the passage of two wave crests at a fixed point is the period of the wave. It is the duration of one complete cycle, measured in seconds. If a crest passes every 0.25 seconds, the period is 0.25 s, and the frequency is 4 cycles per second (4 Hz) since frequency is the reciprocal of the period (f = 1/T). Wavelength is the spatial distance between adjacent crests, not a time measure, while amplitude describes how tall the crest is. The wave’s speed relates these quantities through v = fλ = λ/T.