Question

5. What is the speed of light in air?
(a) 346 m/s
(b) 3/10 m/s
(c) 3x10 m/s (d) 1.8/10 m/s​

Answer 1

Answer:

for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200000 km/s (124000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

One light year: 1.0 year

Metres per second: 299792458

Miles per second: 186000

Parsecs per year: 0.307

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Answer 2

Answer:

For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200000 km/s (124000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

One light year: 1.0 year

Metres per second: 299792458

Miles per second: 186000

From Moon to Earth: 1.3

Explanation:

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