Learning Task 6. Read each item carefully. Choose the letter of your answer. 1. Light travels in a ____________ line when is passes through a single medium. a. curve b. straight c. crooked d. dotted 2. When the sound travels through solids, the vibration of the particles occurs _____________? a. fast b. slowly c. moderately d. irregularly 3. What affects the speed of sound as it travels? a. Person receiving it c. The nature of material b. The origin of the sound d. Loudness of the sound 4. How is heat transferred in solid materials? a. Through convection c. Through radiation b. Through conduction d. Through vacuum 5. What is the direction of heat transfer? a. From hot to cold c. From bottom to top b. From cold to hot d. From side to side