1. The speed of light in a material is 1.93 x 10 8 m/s. What is the index of refraction of the material? 2. Light travels from water (index of refraction 1.33) into crown glass (index of refraction 1.52) at an angle of incidence of 42.0 degrees. Find the angle of refraction in the crown glass. (Ans: 35.8 degrees)
3. Determine the index of refraction of a liquid material if the angle of incidence in air is 40.0 degrees and the angle of refraction in the material is 25.9 degrees?

can someone solve and do working of these 3 questions please thanks alot.

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?