How does light travel?
Light can travel in the air or a vacuum and the speed is constant whether the light source is stationary or moving.
Light only travels in a vacuum and travels faster when the sound source is moving.
Light can only travel in a vacuum and the speed varies depending on whether the source is moving or stationary.
Light only travels in a medium and light travels faster when a sound source is stationary.
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Light travels in the form of electromagnetic waves, which do not require a medium to propagate. This means that light can travel through both air and vacuum. The speed of light in a vacuum is constant at approximately 299,792 km/s. This speed does not change regardless of whether the light source is stationary or moving. Moving the light source does not impact the speed of light.
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