Final answer:
The term referring to the amplitude of a light wave is 'Amplitude,' which determines the wave's intensity, like brightness for light. Loudness in sound is related to 'intensity level or decibel.' The amplitude and frequency of a wave are independent. Therefore, the correct answer is d) Amplitude.
Step-by-step explanation:
The term that refers to the amplitude of a light wave, which is how high or low the wave is, is d) Amplitude. Amplitude corresponds to the magnitude of the wave's displacement and is directly related to the intensity of the wave. For light, amplitude is related to its brightness, and for sound, to its loudness.
In contrast, frequency is the number of wave cycles passing a point per unit time, measured in hertz (Hz), and wavelength is the distance between consecutive peaks or troughs of the wave.
Speaking of sound, the term used to describe the loudness of sound is b) intensity level or decibel. Loudness is influenced by the intensity of the sound wave, which is again a function of the wave's amplitude.
It's worth noting that the relation between amplitude and frequency of a wave is that they are a) independent of each other; changes to one do not necessarily result in changes to the other.