Among radio waves, X-rays, light waves, and sound waves, which one is a mechanical wave, requiring a material medium?

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1. Among radio waves, X-rays, light waves, and sound waves, which one is a mechanical wave, requiring a material medium?

Radio waves

X-rays

Light waves

Sound waves

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Sound waves are mechanical waves — they need a material medium, like air, water, or a solid, to travel. Radio waves, X-rays, and light are all electromagnetic.