QUESTION 1 In making ice cream with a home ice cream freezer, the flavored cream is in a container in contact with melting ice. When the ice cream
freezes it give energy up to the ice / water mixture. What happens to the temperature of the ice / water mixture?
O A. It will increase from the ice cream s heat.
O B. It decreases.
OC. It will not change because the energy is going into its melting the ice.
OD. It will increase from stirring.

-4 on

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.

the ima (higher than 1m) will be greater than the ima with the height of 1m.