Consider a horizontal plane of thin film with a thickness t. This film is located in between air and water (see sketch). Light is directed from the air downward through the film and into the water, perpendicular to the surfaces. The index of refraction of the film n1 = 1.5. The index of refraction of water is n2 = 1.33. The wavelength of the incident wave in the air is λ, and its frequency in air is f = c λ . Air Water t n1 n2 The wavelength λwater of the light in the water is 1. λwater = n2 λ 2. λwater = n1 n2 λ 3. λwater = 1 n2 λ

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

3. dark matter

empty space could also be a simple vacuum