the soviet union was the first country.
Answer:
i think it is <u>teacher</u>
Explanation:
because it is noun
A decagram is 1000 times bigger than a centigram
Answer:
η = 0.7
Explanation:
The refractive index of the material can be calculated by using the following formula:
![\eta = \frac{c}{v}\\](https://tex.z-dn.net/?f=%5Ceta%20%3D%20%5Cfrac%7Bc%7D%7Bv%7D%5C%5C)
where,
η = refractive index of the material = ?
c = speedof light in vaccuum = 3 x 10⁸ m/s
v = speed of light in this material = 4.3 x 10⁸ m/s
Therefore,
![\eta = \frac{3\ x\ 10^8\ m/s}{4.3\ x\ 10^8\ m/s}](https://tex.z-dn.net/?f=%5Ceta%20%3D%20%5Cfrac%7B3%5C%20x%5C%2010%5E8%5C%20m%2Fs%7D%7B4.3%5C%20x%5C%2010%5E8%5C%20m%2Fs%7D)
<u>η = 0.7</u>