Examlex
Which of the following elements is a trace element that is essential to life?
Sound Waves
Vibrations that travel through the air or another medium, perceived as sounds when they reach a person's or animal's ear.
Amplitude
The height or strength of a wave signal, which in the context of sound, affects the volume, and in light, influences brightness.
Frequency
In the context of waves, it refers to the number of cycles or vibrations per unit of time, often measured in Hertz (Hz).
Photoreceptors
Cells in the retina of the eye that are sensitive to light and convert it into signals that can lead to visual perception.
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