Question

multiple choice question
which defines frequency?
the number of waves that pass a given point per second
the distance between equivalent points on a continuous wave
the time it takes for a complete cycle of a wave to pass a given point
the distance from the trough point to the crest of a wave

Explanation:

Frequency is a fundamental concept in wave - related physics. Let's analyze each option:

• The first option: Frequency is indeed defined as the number of waves (or cycles) that pass a given point per second. The unit of frequency is hertz (Hz), where \(1\space Hz = 1\space cycle/s\).
• The second option: The distance between equivalent points (such as two consecutive crests or two consecutive troughs) on a continuous wave is called the wavelength (\(\lambda\)).
• The third option: The time it takes for a complete cycle of a wave to pass a given point is called the period (\(T\)). And there is a relationship \(f=\frac{1}{T}\) (where \(f\) is frequency).
• The fourth option: The distance from the trough point to the crest of a wave is related to the amplitude (if we consider it as half of the vertical distance from trough to crest in a simple - harmonic wave) or just a geometric measure between two points on the wave, not frequency.

Answer:

the number of waves that pass a given point per second