Why does light change path when it changes mediums

During a thunderstorm, a plasma channel forms between the negatively charged clouds and the positively charged Earth, which creates lightning. When lightning is observed, what has passed through the plasma channel

A dam produces 400 watts of electrical energy. What is the efficiency of the dam?

What is tan - 1 (0.52) ?

The formation of an ionic bond involves the? a) sharing of electrons b) transfer of neutrons c) transfer of electrons d) transfer of protons

A bowling ball with a mass of 6.35 kg travels down the lane at a velocity of 6.0 m s. Calculate the kinetic energy of the ball.

Which defintion of heat is most scientifically accurate

What is the name of the effect that causes water to travel at an angle to trade winds?

Two books with different masses fall off the same bookshelf. As they fall, which has more kinetic energy and why

Which of the following is an example of convection? a a hot object transferring heat to a cooler one b the rays of the Sun warming the earth c a hot oven warming the air around it d hot air rising and cooler air falling

Bob drove from home to work at 60 mph. after work the traffic was? heavier, and he drove home at 50 mph. his driving time to and from work was 1 hour and 28 minutes. how far does he live from his? job?