18. Sound travel FASTEST through which medium?
A. Gas
B. Solid
C. Liquid
D. Empty space
19. Which of the following shows a change from light energy to heat energy?
A. Boiling of water
C. warming of beach sand
B. Buzzing of bees
D. answering a phone call
20 A certain appliance underwent energy transformation as shown. What is this appliance?
Electrical energy ➩ light energy ➩ sound energy ➩ heat
A. laptop
B. flat iron
C. electric fan
D. microwave oven
need help
A. Gas
B. Solid
C. Liquid
D. Empty space
19. Which of the following shows a change from light energy to heat energy?
A. Boiling of water
C. warming of beach sand
B. Buzzing of bees
D. answering a phone call
20 A certain appliance underwent energy transformation as shown. What is this appliance?
Electrical energy ➩ light energy ➩ sound energy ➩ heat
A. laptop
B. flat iron
C. electric fan
D. microwave oven
need help
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18. B.Solid
19. A.Boiling of water
20. A.Laptot
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