Light travels 875 km in material “x” in 5.00 ms. calculate the speed of light in the material and the material’s index of refraction

1. Speed of light in the material:

The speed of light in a material is defined as follows:

where

d is the distance travelled by light in the material

t is the time taken

In this problem, we have

is the distance travelled in the material

is the time taken

So, the speed of light in the material is

2. Index of refraction: 1.71

The index of refraction of a material is defined as:

where

is the speed of light in a vacuum

v is the speed of light in the material

For this material, we have

So, the index of refraction is

it about 600 mph from what i calculated

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27