Convert number from scientific notation to standard notation 3.15×10^3

Explanation:

When converting scientific notation into standard notation, it is always important to keep in mind that when 10 has a positive exponent, you move the decimal point to the right. Then if 10 has a negative exponent, you move the decimal point to the left.

So we see,

Since 10 has a positive exponent, we move the decimal point to the right.

10 to the power of 3 (Move decimal point to the right three times!)

3.15

31.5

315.

3,150

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.