4 Prior Power

Consider two different materials with different indices of refraction n. Which of the following is true?

• If 𝑛2 > 𝑛1, refracted ray will bend towards the normal as it enters medium 1.

• 𝑛2 > 𝑛1, refracted ray will bend away from the normal as it enters medium 2.

• If 𝑛2 < 𝑛1, refracted ray will bend towards the normal as it enters medium 1.

• If 𝑛2 < 𝑛1, refracted ray will bend away from the normal as it enters medium 2.

Describe the image that will be produced when you have a concave mirror?

• If the object is placed beyond C, the image will be larger, inverted, and real.

• If the object is placed at C, the image will be same size, inverted, and real.

• If the object is placed at F, the image will be same size, upright, and virtual.

• If the object is placed between F and V, the image will be smaller, upright, and virtual.

1.    In 1827, Georg Simon Ohm discovered the relationship between voltage, current, and resistance. He found out that electricity behaves similarly to water in a pipe. Through this observation, he was able to summarize the relationship among EMF or voltage (V), current (I), and resistance (R). This enables us to solve for the electrical current of a conductor given a voltage of 25 V and a resistance of 10 𝛺 which is equal to _____.

The length of the conductor is another factor that affects the resistance offered by a material. In what way?

• The longer the conductor, the more current flow through it.

• The longer the conductor, the more resistance to the flow of current which means more current to flow.

• The shorter the conductor, the more resistance to flow through it.

• The shorter the conductor, the more resistance to the flow of current which means more current to flow.

The way our eyes estimate distances of objects we see is based upon the assumption that a ray of light travels in a straight line. This idea is based from

• Fresnel's Laws of Reflection and Refraction

• Fermat's Principle of Least Time

• Fundamental Law of Light Propagation

• Fundamental Principle of Geometrical Optics

What will be the image produced by a concave mirror if upright object is placed between the vertex and the focal point?

• The image will be inverted, larger, and real

• The image will be same size of the object, inverted, and real

• The image will be inverted, larger, and virtual

• The image will be upright, larger, and virtual

Electricity can flow in different ways. In direct current (DC), how does the electricity flow?

• It flows in one consistent direction.

• It alternates direction back and forth.

• It moves only upward and downward.

• It flows in forward and backward directions.

In a town where the electricity comes from a nearby power plant. The power company uses a type of current that makes it easier to send electricity over long distances. Which type of current do they use?

• Direct current (DC), because it is less dangerous.

• Alternating current (AC), because it is easier to transmit over long distances.

• Direct current (DC), because there is no longer a need for it.

• Alternating current (AC), because there are plenty of batteries available.

What will happen to the induced emf if the number of loop is doubled?

• doubled
• halved

• remain the same

• increase four times

What does the abbreviation "emf" refer to?