What characteristic of light corresponds to its brightness?

• A. Wavelength
• B. Frequency
• C. Amplitude
• D. Speed

Answer: (C)

The characteristic of light that corresponds to its brightness is amplitude. In the context of light waves, amplitude refers to the height of the wave, which determines how much light energy is being emitted. A greater amplitude results in a brighter light, while a smaller amplitude leads to a dimmer appearance.

Wavelength is related to the color of the light; different wavelengths correspond to different colors in the visible spectrum. Frequency is similarly associated with color, as it is inversely related to wavelength. Speed refers to how fast light travels, which is constant in a vacuum but does not determine brightness. Thus, amplitude is the key factor that influences the intensity or brightness of light.