When light passes through water, it’s velocity is reduced by 25%. if the speed of light in a vacuum is 1.86 x 10^5 miles per second, at what velocity does it travel through water? write your answer in scientific notation.

The speed of light in water is 1.395 × miles per hour .

Step-by-step explanation:

Given as :

The speed of light in a vacuum = = 1.86 × miles per sec

Let The speed of light in water = miles per hour

When light passes through water, its speed reduced by 25%

So,   = 1.86 × miles per sec - 25% of

Or, = 1.86 × miles per sec - 25% ×  1.86 × miles per sec

Or, = 1.86 × miles per sec ×( 1 - )

Or, = 1.86 × miles per sec ×

Or, = 1.86 × × 0.75

∴   = 1.395 ×  miles per hour

So, The speed of light in water = = 1.395 × miles per hour

Hence, The speed of light in water is 1.395 × miles per hour . Answer