Question

The speed of light in air is:; A. 3 x 108 cm/s; B. 3 x 108 km/s; C. 3 x 108 mm/s; D. 3 x 108 m/s

Answer 1

Answer:

d) 3×108

Explanation:

d option is correct for this

question

Answer 2

Answer:

(D) $3 \times 10^{8} ms^{-1}$

Explanation:

Speed is defined as total distance traveled by a body in a specific time. Mathematically it is represented by:

$Speed = \frac{Distance \ traveled}{Time \ taken}$

Now,

As we know that,The refractive index of air for visible light is about 1.0003,

So, the speed of light in air is about 299700 km/s which is approximately equivalent to $3 \times 10^{8} ms^{-1}$

Hence, the correct option is (D).