You will need too know the mass and velocity
A flow of electrical charge from one place to another
is called an electric current. It doesn't need to be steady.
Answer:
n = 1.5
Explanation:
The speed of light in vacuum is 300000000 m/s
The speed of light in glass is 200000000 m/s
We need to find the refractive index of the glass.
We know that, the ratio of speed of light in vacuum to the speed of light in medium is equal to refractive index of the medium.

So, the refractive index of the glass is 1.5.
Answer:
Explanation:
specific heat of granite S = 800 J /g°C
increase in temperature = 15.5 °C .
mass = m ( let )
Heat needed to raise temp = mass x specific heat x rise in temperature
150,000 = m x 800 x 15.5
m = 12.096 g .