PART 2: Choose the letter of the correct answer

11. Which of the following materials is visible to the human eye, and is a part of an electromagnetic spectrum?

a. air

b. light

c. sound

d. water

12. Which kind of materials do not allow or block light to pass through?

a. tarnslucent

b. opaque

c. oval

d. transparent

13. Which color is considered an ultimate heat absorber?

a. pink

b. yellow

c. black

d. white

14. What is the coolest color?

a. red

b. black

c. violet

d. white

15. Which process involves the passing of light through some materials?

a. refraction

b. absorption

c. transmission

d. reflection​