Praxis 5005 Practice Question
The speed of light in empty space, that is, a vacuum, is 300,000 km/s. The speed of sound in empty space is:
Correct Answer: A
Rationale: In empty space, sound cannot travel because it requires a medium (like air, water, or solids) to propagate. Therefore, the speed of sound in a vacuum is effectively zero.
Option B suggests a positive speed, which is incorrect since sound cannot exist in a vacuum. Option C incorrectly equates the speed of sound to the speed of light, which are fundamentally different phenomena. Option D implies that sound can travel faster than light, which contradicts the principles of physics. Thus, the only accurate statement is that the speed of sound in empty space is zero.
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