Which of the following cannot travel through a vacuum?

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Heat waves

Sound waves

Light waves

X-rays

answer is D.

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Detailed Solution

Light waves, heat waves, and X-rays are examples of electromagnetic waves, which do not require any medium for their propagation.
Sound waves cannot travel through a vacuum. It needs a material medium for its propagation. Sound waves can propagate only when the vibrational energy of the particles of the medium is traveling from one point to another.

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