Question

1. light travels fastest when passing through which of these mediums?

a. water
b. glass
c. a vacuum (empty space)
d. air

1. when light moves from air into water, it slows down and changes direction. this change in direction is called:

a. reflection
b. absorption
c. refraction

1. which statement about the speed of light is true?

a. light travels fastest through a dense medium like diamond.
b. light travels at the same speed in all mediums.
c. light travels slower in materials like glass and water than it does in a vacuum.
d. light speeds up when moving from water to air.

Explanation:

• Question 4: Light travels fastest in a vacuum. In other mediums like water, glass, and air, light interacts with particles, which slows it down.
• Question 5: When light moves from one medium (air) to another (water) and changes direction due to a change in speed, this is called refraction. Reflection is when light bounces back, and absorption is when light is taken in by a material.
• Question 6:
• Option A: Dense mediums (e.g., diamond) slow light down, so this is false.
• Option B: Light speed varies in different mediums (e.g., slower in water than in air), so this is false.
• Option C: Glass and water are denser than a vacuum, so light is slower in them, which is true.
• Option D: While light speeds up when moving from water to air, the statement in option C is a more general and accurate description related to the comparison with a vacuum.

Answer:

1. C. A vacuum (empty space)
2. C. Refraction
3. C. Light travels slower in materials like glass and water than it does in a vacuum.