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: Refraction is the bending (change in direction) of light when it moves from one medium to another (e.g., air to water). Reflection is the bouncing back of light, and absorption is when light is taken in by a material.
• Question 6: Light travels slower in denser mediums (like glass and water) compared to a vacuum. It does not travel at the same speed in all mediums. While light speeds up when moving from water to air (less dense medium), the key correct statement is about its speed in vacuum vs other materials.

Answer:

• Question 4: C. A vacuum (empty space)
• Question 5: C. Refraction
• Question 6: C. Light travels slower in materials like glass and water than it does in a vacuum.