lightupscience（科学）5a课件unit2soundlesson2wherecansoundtravel？.pptx

U U NITNIT 2 2 S SOUNDOUND S SOUNDOUND 声音声音 gas (气体) liquid (液体) solid (固体) travel (传播) Lesson 2 Where Can Sound Travel? Can sound travel in space? I cant hear you. We must go to the space station. Pluck an elastic band. Can you hear the sound? If you are in space, can you hear the sound? Why? Sound ( can / cannot ) travel through air. There is no air in space. Sound ( can / cannot ) travel in space. Can sound travel through a solid? You needYou needYou needYou need string fork Tie a loop in one end of the string. Tie the other end to a fork. Put the loop over your finger. Then put your finger into your ear. Let your friend tap the fork. What to doWhat to doWhat to doWhat to do 1 2 I (can / cannot) hear the sound of the fork. Sound (can / cannot) travel through solids. ResultResultResultResult ConclusionConclusionConclusionConclusion Can sound travel through a liquid? You needYou needYou needYou need water plastic bag radio Put a radio in a plastic bag. Seal the bag. Put the bag under water. Turn on the radio through the bag. What to doWhat to doWhat to doWhat to do 1 2 I (can / cannot) hear the sound of the radio. Sound (can / cannot) travel through water. ResultResultResultResult ConclusionConclusionConclusionConclusion Sound can travel through solids, liquids and gases. Sound cannot travel in space. I made sounds. I did experiments. I measured sounds. Make “string telephones”. Talk to a friend. Can you hear each other? How does the sound travel? WorkbookWorkbookWorkbookWorkbook