The speed of light in empty space, that is, a vacuum, is 300,000 km/s. The speed of sound in empty space is:

Rationale

The speed of sound in empty space is 0.

Sound requires a medium, such as air, water, or solids, to propagate; in the vacuum of space, there is no medium available, which means sound cannot travel at all. Therefore, the speed of sound in empty space is effectively zero.

A (0) CORRECT

This choice correctly identifies that sound cannot travel in a vacuum, where no particles are present to transmit sound waves. The absence of a medium means that sound does not exist in this environment, making its speed zero.

B (greater than 0 but less than 300,000 km/s) YOUR ANSWER

This option suggests that sound could travel in a vacuum at some speed, which is incorrect. Sound waves rely on the vibration of particles in a medium; without any particles in a vacuum, sound cannot propagate, hence it cannot have a speed greater than zero.

C (300,000 km/s) YOUR ANSWER

This choice inaccurately assigns the speed of light to sound. While light travels at approximately 300,000 km/s in a vacuum, sound cannot achieve any speed in a vacuum. This option misrepresents the fundamental nature of sound waves, which do not exist without a medium.

D (greater than 300,000 km/s) YOUR ANSWER

This option is misleading because it implies that sound could exceed the speed of light in a vacuum, which is impossible. Sound cannot travel at any speed in a vacuum, let alone exceed the speed of light, as it requires a medium to propagate.

Conclusion

In conclusion, the speed of sound in empty space is zero because sound waves need a medium to travel through. Since a vacuum lacks such a medium, sound is unable to propagate, resulting in a speed of zero. Understanding this fundamental distinction between sound and light is vital in the study of physics and wave propagation.

The speed of light in empty space, that is, a vacuum, is 300,000 km/s. The speed of sound in empty space is:

The speed of sound in empty space is 0.

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