The speed of light in empty space, that is, a vacuum, is 300,000 km/s. In water, the speed of light is

Rationale

In water, the speed of light is greater than 0 but less than 300,000 km/s.

The speed of light in a medium like water is slower than its speed in a vacuum due to the refractive index of water, which causes light to travel at approximately 75% of its speed in a vacuum.

A (0) YOUR ANSWER

This choice suggests that light does not travel in water, which is incorrect. While the speed of light is reduced in water compared to a vacuum, it is still a significant positive value. Light can and does travel through water, albeit slower than in a vacuum.

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

This choice accurately reflects the behavior of light in water. The speed of light in water is approximately 225,000 km/s, which is indeed greater than 0 and less than the speed of light in a vacuum, confirming the effect of the medium on light speed.

C (300,000 km/s) YOUR ANSWER

This option incorrectly indicates that light travels at its maximum speed in water, which is true only in a vacuum. The presence of water's refractive index reduces the speed of light significantly, meaning it cannot reach the speed observed in a vacuum.

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

This choice is fundamentally incorrect, as it implies that light can exceed its maximum speed in a vacuum while traveling through water. According to the laws of physics, the speed of light in any medium cannot exceed its speed in a vacuum.

Conclusion

The speed of light in water is a prime example of how light behaves differently in various media. It travels faster than 0 but slower than 300,000 km/s due to the effects of refraction. Understanding the speed of light in different substances is crucial for applications in optics and various scientific fields.

The speed of light in empty space, that is, a vacuum, is 300,000 km/s. In water, the speed of light is

In water, the speed of light is greater than 0 but less than 300,000 km/s.

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