In lightning strikes, the image first appears in the sky, then the sound is heard. When we sing in a mountainous place, our voice echoes and disperses.
Whereas the light we reach reaches it immediately.So,This indicates that the light is faster than the sound.
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The light is emitted in the form of electromagnetic waves and sound in the form of mechanical waves. The material environment (solid, liquid, gas) is essential for sound to spread.
So, when the sound spreads in waves, it slows down by attaching to objects that exist in the environment.
However, such a situation is not the case in the spread of light. Light spreads easily both in the material environment and in space.
So,The lightining is faster than sound.