Yes, in general, the relative amplitude of an electromagnetic wave correlates with the relative intensity of light falling on an object or surface, as well as the relative brightness of the color perceived by an observer.
The intensity of light refers to the amount of energy carried by the electromagnetic wave per unit area. It is directly proportional to the square of the amplitude of the wave. Therefore, an increase in the amplitude of the electromagnetic wave will result in a higher intensity of light.
When light falls on an object or surface, it interacts with the material, and depending on its properties, it may be absorbed, transmitted, or reflected. The relative intensity of the light falling on the object or surface affects the amount of light absorbed or reflected, which, in turn, influences the perceived brightness of the object or surface.
The perceived color of an object or surface is related to the specific wavelengths of light that are reflected or transmitted by the object. The relative amplitude of the electromagnetic wave determines the intensity of light at different wavelengths. If the relative amplitude is higher for certain wavelengths, the corresponding colors will appear brighter to an observer.
It's important to note that the relationship between the relative amplitude of the electromagnetic wave and the perceived brightness or color can be influenced by various factors, such as the properties of the object or surface, the characteristics of the observer's visual system, and the surrounding lighting conditions. However, in general terms, the relative amplitude of the wave does play a role in determining the relative intensity of light and the perceived brightness of colors.