No, humans cannot see or hear high-frequency sounds, which correspond to light waves. Our visual system is sensitive to a specific range of electromagnetic waves known as the visible spectrum, which includes colors ranging from violet to red. Light waves have much higher frequencies than the audible sound waves that we can hear.
The speed at which light travels is a fundamental constant known as the speed of light, which is approximately 299,792 kilometers per second in a vacuum. In other media, such as air or water, light travels at slightly slower speeds. For example, in air, light travels at approximately 299,702 kilometers per second.
When light travels from an object to our eyes, it moves at these speeds depending on the medium it is passing through. The speed of light remains constant, but it can be slightly affected by the refractive properties of the medium it traverses. However, for most practical purposes, the speed of light is considered to be constant and approximately 299,792 kilometers per second in a vacuum.