Energy, Light and Sound (Lesson 5)

 FOCUS QUESTION

How does sound behave?

SPECIFIC OBJS.

 1.  Investigate some properties of sound

 2. Describe sounds using scientific language

 3. Work cooperatively in groups

 4.  Show curiosity in investigating the property of sounds

CONTENT SUMMARY

ENGAGE

Review past lesson on sound by way of questioning. 

Students do you recall what the states of matter are? Which of the states of matter do the rulers represent. (solid) 

Do you believe sound is able to travel through the other states of matter?

Let's do some experiments to find out.

EXPLORE

You will perform experiments in your groups with bottles having different volumes of water in each of the bottles. One of the five (5) bottles will remain empty (full of air).

You will knock the top edge and/or blow over the mouth of each bottle, with the same force. Record your observations and draw conclusion.

Now half fill a drinking glass and gently knock the side of the glass above the water level with a metal spoon or knife. Record your observation. Knock the area below the water level then record and offer simple explanation for your observation.

Let's listen to this video clip below to learn more about how sounds travel.

Video clip: How sound travels

Let us read this chart aloud that sums out the information we learnt.

EXPLAIN

Present your conclusion of the experiments in your groups.

How does sound travel?

Through which medium sound travels fastest?

Why?

What must be present for sound to be conveyed?

EXTEND/ELABORATE

Watch the youtube video clip (Sounds need a Medium) below which summarizes information learnt. Glean additional information for note taking.

Video: Sound needs a medium

In groups, students will use an appropriate media to summarize the content learnt from the lesson and present same to their classmates. (Dub Poetry, Dramatization, Song)

RUBRIC FOR PRESENTATION

Criteria	Excellent 4pts	Good  - 3 Points	Fair – 2 Points	Poor – 1 Point
Content	Explanation is clear and shows complete understanding. Concepts and facts are accurate	Complete understanding of concepts with 3 facts and concepts accurate	Shows evidence of understanding but facts and concepts are not accurate	Explanation is unclear, lacks accuracy and understanding of concepts
Group Participation	All members participate in the activities	Three members participate in the activities	One member participates in the activities	No work was done in the group
Creativity	Students used a very creative media to present their information	Students used a simple but creative media to present their information	Students little or no form of creativity in their presentation	Students’ presentation is dull and lacks creativity

Other video clips for notetaking.

Video clip. Sound 

EVALUATE

1. Use the words below to fill the blank spaces.

    

solids        gas            Liquid         medium      vibrating      energy   vacuum  Sound is a form of ________. For a sound to be heard, something must be _________. This is referred to as a back and forth movement. Sounds need a _______ to be heard. It can travel through solid, _________ and gas. Sounds travel fastest through _____. Sound cannot travel through an empty space or a _____________.

2. A student conducted an investigation using 3 containers of the same type, 3 microphones, a radio and  sound recording devices that measured sound in decibels. He put water, sand and air in each container. The diagram shows the setup of the investigation. Use the information to answer the question below.

 

           

 Which question is the student most likely trying to answer using this experiment?

(a)    What kind of medium makes sound?

(b)   In what kind of medium is sound heard the loudest?

(c)    Can sound be heard in containers?

(d)   Will a microphone capture sounds heard from a radio?

Use a [ü] to indicate if the statements below are true or false.

Statements	True	False
Sounds travel at the same speed in all materials.
Sound travels as wave in an outward direction.
Sounds travel fastest in liquid.
Sounds can be heard with or without the presence of air.