Aflat sheet of ice has a thickness of 2.12 cm. it is on top of a flat sheet of fused quartz that has a thickness of 1.24 cm. light strikes the ice perpendicularly and travels through it and then through the fused quartz. in the time it takes the light to travel through the two sheets, how far (in cm) would it have traveled in a vacuum?

4.674 cm

Explanation:

refractive index of ice μ₁ = 1.309

refractive index of quartz μ₂ = 1.544

Velocity of light in ice v₁ = c/μ₁

= 3 x 10⁸ / 1.309

= 2.292 x 10⁸

Velocity of light in quartz v₂ = c/μ₂

= 3 x 10⁸ / 1.544

= 1.943 x 10⁸

Total time taken by light to pass through ice

= 2.12 x 10⁻²/ (2.292 x 10⁸ )

= .92 x 10⁻¹⁰ s

Total time taken by light to pass through quartz

= 1.24 x 10⁻²/ (1.943 x 10⁸ )

= .638 x 10⁻¹⁰ s

Total time taken

=  .92 x 10⁻¹⁰ + .638 x 10⁻¹⁰

= 1.558 x 10⁻¹⁰ s

velocity of light in vacuum

= 3 x 10⁸ m /s

distance travelled in 1.558 x 10⁻¹⁰ s

= 3 x 10⁸ x 1.558 x 10⁻¹⁰

= 4.674 x 10⁻² m

4.674 cm

the amount of current in the coil

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.